I have one of the sticknfinds on my keychain and it does work reliably for that, although I was given it and would not pay $25 for it. Haven't tested the range on it either.
I did buy one of these:http://distance-rc.com/store/index.p...&product_id=51
It's the distance-rc beacon. It's similar to the FMkit beacon but without the microphone that the FMkit beacon has. With this one you just set a delay and it will start transmitting after the delay. It was a bit cheaper and it uses less power so it should transmit for longer, and with a customizable delay I think it will work good.
When it arrives I will have to try it out to see how accurate I can be at finding it. I have some motorola walkie talkies without a removable antenna but I'm hoping they will work just fine.