Buy.com via eBay offers the refurbished Garmin nüvi 50LM 5" Portable GPS Navigation System with Lifetime Maps, model no. 010-00991-21, for $59.99 with free shipping. That's $15 under our December mention of a new model and the lowest total price we've seen. (It's a current low for a refurb by $13.) The GPS features a 5" 480x272 touchscreen LCD, free lifetime map updates, voice navigation, lane assist, maps of the US, microSD card slot, and USB.
A 1-year warranty applies, but it's unclear who backs it.