Welcome!!
Actually, I know there are a lot of RM users who roast on fluid bed. I talk to a lot of Artisan roasters regularly.
Data Logging users were disappointed to hear about the Bluetherm Duo being discontinued, but hopefully it won't be long before the replacement is out.
In the meantime, Phidgets is the only option for traditional thermocouples. That will change, though, once the RDP I mentioned on the other thread hits (hopefully in November).
Email be if you'd like more info about it, or if you have any questions - support@rainfroginc.com
Danny