The best price from a reputable dealer is $43 per pair for the Motorola T5720 (AA model). The T5920 is about $25 per pair more. It's rechargeable (actually, I think they all can either use batteries or a rechargeable battery pack). The T5920 has 99 "privacy codes" per channel, as opposed to 22 for the other model It also has a "vibrate" model for paging another unit.
I don't have enough expertise in this area to know if the extra money is worth the price. These guys are Reserve, so they may never see the latest commo gear. It breaks my heart that they're buying civilian non-secure radios, but they're the troops on the ground, and have decided it helps their survival, as opposed to no radios at all.
Steve said the Motorolas are only used when away from the trucks, which have donated CB radios {shudder}. What is the best thing we can do for these troops? Money is no object for buying 3 pairs of these radios, even for me. But I'd like to have a clean conscience, knowing I was doing the right thing by the troops.