I am not able to produce in large quantity. However, whenever I have to build the sensor modules, typically, I have more than I can use. In my original thread, I have shared them with members here. In return, I have requested donation for the project.
I use donation to buy more part and make more revision to the board. I did have a manufacture in China to build 10 unit. It was so expensive. I just want to test them whether they can build the sensor with good yield. The good news is that they can do much more superior job than I can in assembling the sensor. The bad news is I blew all the donation fund on that trial run. They are expensive. The only way to get something reasonable is to have them build in much larger quantity.
In the long term, I am considering a case. Many people ask about the case. Case complicate things with temperature sensor. There are many battery operated temperature sensor. They sleep most of the time. Putting them in the case had negligible impact. My design require the MCU run all the time for the Zigbee Routing capability. This has heat implication. Please do not get me wrong, the MCU is not like a PC or Fireplace. It does generate give and take about 4 to 6 degree Celsius offset in a case. This is a solvable using isolation compartment. However, I am not ready to deal with this kind of design work yet.