Tommy:
For an AN/PRC-25 (RT-505), or an AN/PRC-77 (RT-841), try the usual search engines.
I wouldn't bother with US vendors on eBay since ITAR restrictions won't allow shipment out of the US. You'd be surprised what is available from such places as Greece and Israel!
Good luck.
BTW...what you referred to as a PRC-10...that looks very much like an AN/PRC-510, a Canadian VHF unit operating on the 38.0-54.9 Mhz...Coy to Bn comms, although I do believe that there was/is such an American unit looking very similar. Maybe we copied the Yanks?
