I'm curious, the PRC-90 is a military only radio, it doesn't work on the civilian emergency aviation band, as such it would be pretty much useless to the average person, not to mention illegal to transmit with. The PRC-112 is also a military SAR radio, not suited or meant to be used by civilians. I've never heard or seen a "civilian version" of either one of those radios.

What exactly are you looking for? A beacon, a transceiver?