Cheapest energy monitoring plug?

I’m looking for 2 of the cheapest energy monitoring plugs I can get? 1 plug needs to be 240v for my Dryer and 1 needs to be 110v for my Washer.

What country are you in, what model of the hub do you have, and what version of the SmartThings app are you using (classic or “smartthings ( Samsung connect)“)?

I live in the United States I have version 2 of The hub and I use both classic and the new app. I prefer classic right now because I can add custom apps with ease.

I still yet to find a cheap way to monitor the dryer. So that I can automate it with text alert when it’s done.