BuyDig offers the refurbished Garmin Nuvi 4.3" GPS with Lifetime Maps, model no. 44LM, for $59.99 with free shipping. That's $23 under the lowest total price we could find for a new one. It features lane assist, an emergency services locator, microSD slot, USB, and lifetime access to NAVTEQ map data.
A 1-year warranty is provided, but it's unclear who backs it.