This deal has ended.
Buy.com has their refurbished model of the TomTom Go 510 Portable GPS System for $149.49. Featuring a 4" LCD display and voice-prompted navigation, it also comes with maps of the US and Canada pre-loaded on a 1GB SD memory card. Plus, new customers can use this $5 off $100 coupon or new Google Checkout can get a $10 off discount (you can't get both). Shipping is free and there is no tax (except CA, MA, MD, TN).