Re: Looking for a good, affordable GPS...
You probably don't need a tracker with real-time updates.
You really just need a GPS Logger.
I bought one from Brickhouse. I think it was about $200. It was a little bigger than a memory stick, and was magnetized so that I could stick it up under the passenger car seat and not worry about it rolling around.
It ran on batteries. It would activate when the car started moving. It turns off when the car stops for more than a few minutes. That helped conserve the battery. I could remove it from the car anytime, plug into my computer, and it would download everything. It came with software that gives you the info of where the car is (physical address), what time, how fast the car was travelling, etc. It would also bring up a map, and you could watch the little car icon drive around. It was cool, and a cheap way to get the info I needed.
I was able to use the GPS logger to prove my Ex was lying about where she was. I was also able to determine the exact address she was going to.
With the logger, you avoid the monthly fees. However, the down-side is that it is not real-time surveillance.