I got very frustrated trying to source suitable usb fobs in the UK. Various alternative solutions such as the URI seem to attract too many on-costs for shipping, customs etc to make them viable alternatives over here in Scotland. I decided to design a circuit board to integrate a CM119 with one of the small Dorji radio modules which has proved succcessful, the resulting nodes being integrated into a 2.4Ghz AREDN network. http://www.feednet.org.uk Since then I did a much smaller board that provides just the functionality of a usb fob but with better RF filtering and an 8P8C socket for the radio interface. It is possible to obtain PCBs from Itead for example, for only a few dollars, even in production runs of as little as 10. The CM119s I sourced from AliExpress. All have seemed ok so far. I also got some from a mainstream US chip supplier. That is not to say that there won't be supply problems in the future - just relating my experience. Making your own isn't for everyone, but it really isn't that hard to do and I find it's a more pleasant experience than trying to bodge existing fobs. 73 Bernie GM4WZG