Moshe these work well and are robust http://www.pryme.com/index.php?l=product_detail&p=2231 Just have to make sure you have the right plug. I have a set I can bring to the airport if you want to play with them.
How do you deal with the dearth of available frequencies? (There are 720 of them, and we only get 2?) Some people use some other frequencies in the av band that are not "official". I've tried using some old Sprint cellphones with the Direct Talk feature, they work as walkie-talkies (peer to peer, no cell towers involved). Free from the congestion on the FRS bands. The stumbling block so far has been finding/making suitable PTT headsets. And they don't do VOX.