Have a Bluetooth GPS here that I got with a Sony Ericsson P1i, I've only tried it out when I first got it, been sitting in a corner ever since.
It comes with the battery and a car charger. Don't know the exact model or anything else about it really.
Looking to sell it for £10 (will include 1st class) -- I think this is pretty cheap for a Bluetooth GPS unit.
Payment via BT, 1st class shipping included, will add recorded if you pay for it, will send it out Saturday morning.