i bought a holux gpslim 236 for around $70 usd including shipping & i'm very happy with it. it comes with a car & home charger but will also charge off your pc <usb>. it was ranked highly by the gps guru sites i came acrossed - so far so good. maemo mapper found it without a hitch. the only bummer is if you don't have BT on your laptop you'll need a special cable.

cheers