Plenty of used untis on eBay. If you get an XTR8CK (identical to the Starmate 2 but slightly different looking outer jacket and sold in Costco by the hundreds of thousands in the famous 1/9/06 revolution timeframe), there is a known cold solder joint failure mode. It is easy to fix, so if someone is selling one with an alleged power problem or intermittant power problem (when you go over a bump in the car), it is one of the outer feet on the power receptacle where it is surface mounted to the circuit board.
I fixed mine and I fixed a coworkers 2 weeks ago. Mine went after 15 months and his went after over 3 years. They now work perfect.
Easy to move between vehicles and home and lots of parts (antennas, power cords, suction cup mounts, etc.) on eBay.
Newer models are naturally also available on eBay as well. Lots and lots of them.