I should have been looking for one of those.. I just purchased a back-up for my old CAI.
Remote monitor control temp humidity I/O WebControl X10RF new hw rev 2.3.8 | eBay
It's a little better than the old model, but should be a drop-in replacement..
I want to use my really old CAI board (now in the spares box) to build a water leak & Radon warning system.
That was the 1st CIA I got, it had bad RH detection firmware.. Negative numbers..