If you're looking for a personal locater beacon, REI.com has the ACR
Terrafix 406 GPS equipped unit (item 709917) for $560, after a 20% off
coupon code for members (it costs $15 to join), and you can pick it up
at your local store if you like. You can also get the non-GPS version
for $480...

http://www.rei.com/

Marc