I would like to have this thread dedicated to cheap Smart devices which work with SmartThings. It is kinda hard to find some of these devices and would be helpful for new ST users as some might be spending a lot of money getting started.
thank you
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There actually is a section of the forum devoted to deals. You might routinely check that out.
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I think the idea for this thread in the deal section is fine but at the same time, the price of the device should be based on the problem that you are trying to solve. Itâs fine to have a budget, but to be honest there are very few devices under $10 that will work with SmartThings and if you limit yourself to that thereâs not going to be much you can do. Of course if youâre just using it as a hobby, thatâs fine, but youâre going to need to do a lot of maker type stuff to hit that target.
When it comes to practical home automation, I think youâll find that inexpensive switches and sensors will generally be in the $20-$30 range, inexpensive smart bulbs will be in the $12-$15 range, and inexpensive everything else will cost more than the switches. You certainly wonât find thermostats or smart locks under $10.
If you really want to stick to things under $10 youâre going to have to look for closeouts of models which are being discontinued and replaced with something new, and, as @Philb mentioned, youâll already find hot deals of that kind listed in the deal section.
So Iâm not saying donât do it, Iâm just saying thereâs not going to be much listed.
I would also be extremely cautious about buying cheap stuff, typically from China, that is not UL or CE listed. Saving money in the short run wonât help much if you burn down your house. 
I myself am on a limited budget and approach things differently. For my phase 1, I set a max limit of $1500 and decided to only buy things that I would be willing to replace in two years. That gave me time to explore home automation and figure out what I wanted to do with it.
Going into phase 2, I set a limit of $300-$500 per room, and I donât do every room in the house. That means that in some rooms I might do just one of the light switches rather than all of them. I have a voice controlled home theater set up in the room I use the most, but not in the ones that my housemates use.
Doing it that way just kept me from going crazy and buying every cool gadget just because it looked cool. But for me, home automation is about solving specific practical problems (I am quadriparetic, use a wheelchair and have limited hand function), and I know other people will look at it differently. whatever works for you. And if setting a device limit of $10 meets your requirements, go for it. You just may have to wait a long time between purchases. 
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Agree w/@JDRoberts comments, but I can add one device that is (right now while on sale) <10. 
http://www.zwaveproducts.com/shop/climate-control/z-wave-energy-management/z-wave-smart-energy-meter
SmartThings thread:
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There are a series of projects you can do for under $10 based on Wi-Fi. They all use an ESP8266 dev board. These projects are definitely not going to be fire safe for putting inside a wall, so donât even think of that. Also, personally, I would not splice them into electrical cords for anything drawing significant power, although I know some people do that.
But if you just want to make a button you can push and trigger IFTTT or a web service endpoint , this is a cool project:
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And hereâs a $10 open/close sensor project, Wi-Fi again, from the same designer.
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thank you @JDRoberts, @Danabw, @PhilB for the comments/links. I would really like to track the prices on some of these in the next 6 months and see if they drop drastically. I got the ST hub and found the prices on smart devices to be very high (for me at least :-)) but I went ahead and got some and love working with CoRE. Users will be more willing to join if we can start them off with some cheap, reliable devices (z-wave, zigbee, wifi, ble - soon, etc.). The âDealsâ thread donât seem to have much since July 16. Hopefully we will have some things to post here in the near future 
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Deals grew to become a whole category. 
Thatâs why the original thread has gone quiet.
Thereâve been a ton of deal postings in the last few months. And always check the Loweâs thread, there are often really good deals there.
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Deals thread has quieted down. Seems after all the fall clearance , BF and Christmas sales retailers are taking a breather.
One thread to watch in the deals category is the Loweâs thread. There are quite often " regional price discrepancies " ( trying to be politically correct) that members of this forum are great at finding. Not uncommon to find different stores selling devices at 60-70% off the national price. I have well over $1000 in " extra" switches, sensors, lights sitting on a shelf that I have picked up when on sale just waiting for a place to use them. While not under $10, getting a $40 switch for $12 is nothing to pass up.
Amazon and specifically the Amazon Alexa deals have had a lot of HA specials lately. Z-wave outlets for $15 is one I remember. grabbing recently. Of course you need to have Amazon Prime and an Alexa device to get those.
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Iâve noticed this as well. Most of the deals having been Alexa deals and âhiddenâ from the typical lightning/daily deals and the Prime exclusive deals.
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Not even being the featured deals she tells you about when you ask. You have to go to the website to see them.
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@RLDreams - sure will check out Lowes. TY
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Pretty sure these work with ST. Xiaomi Temp/Humidity sensor $.6.99 shipped
Maybe not compatible, based on this thread and @JDRoberts post in it on Xiaomi sensors:
not sure if works with ST. Charging $6-7 for shipping 
A NIB 5 year old ZigBee, from unknown manufacturer. It may work, but being ZB, better than average chance it will have some proprietary protocol and not work or take some DTH fondling to figure it out.
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Anyone who fondles my device type had better be ready for a long-term relationship commitment. I am not easy.
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There have been multiple changes in the last few months in how SmartThings handles zigbee, one update broke the Xiaomi integration for a while, but then a later one appears to have fixed it for many people. Which is excellent. But unfortunately there still people who find these devices will only work when they are within one hop of the hub. So working for some people, not for others.
There is a newer thread then that one which has the device type handlers and current discussion of these devices. So check there for the latest news and code.
I donât personally feel comfortable recommending these devices yet, particularly for new people, as they can definitely lead to frustration. But if somebody wants to experiment with them and you can buy them from a place with a good returns policy, they may be worth a try.
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Please give them a try, and once you know for sure, report back.
If they do indeed - for sure - work with ST, Iâll buy some too.
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They are working i have them instaled for over 6 month now and they are working great they are latest generation Mija type easy to pair also i have motion sensors also they were easy to pair a little bit harder to pair are the temp humidity
But also work once you are done pairing they did not fall off the network once