Remember the TomTom One 3rd Edition GPS from a couple weeks ago? It was a sweet deal at $119.99, but now it's even sweeter: Buy.com has refurbished Ones on sale for $99.99 (after a $20 mail-in rebate). Shipping is on the house.
I won't reinvent the wheel, here--check out my original post if you want to read more about this well-regarded navigator. I will say that it's rare to find a big-name GPS for under $100; most models in that price range are off brands. The rebate deal ends April 20, so if you want in, chop-chop.