I have a regular GPS (E-Trex 30). I have looked at a few locator beacon type unis. I didn't like the monthly expenses attached to the devices I found. While searching for units I found one that looks pretty good with no monthly fee. It is called ACR ResQlink and it is a one time use device. On the company's website, it says they will replace it after its use with a rescue story. It lacks some of the features that other units have, but it has no monthly fee and it sure beats what they had in 1849
ACR ResQlink for about $299 (and other Models for more $)