Interesting but the Airtronics website is still up and Hobby People still lists Airtronics radios. Here's the SD-10GS that I bought a couple of weeks ago in the US using Airtronics' trade-in program. I turned in an old non-functioning RDS8000 and got the SD-10GS (with the new 10-channel Rx) for $272. The old radio had to be dropped off and and the new one picked up at Hobby People. Well, actually, I could have shipped it and had it shipped back but that would have added weeks to the process.

Yeah, it says SANWA at the top, but Airtronics is all over the menu system (and the manual).

Incidentally, I have NEVER seen a Sanwa Tx during my 10 years of doing RC in Japan (it's all Futaba and JR). I don't think you can even order one through the major online RC shops here. I've never seen a listing.