Buy.com has the Nextar Q4 Portable GPS Unit for only $149.99. This features a 4.3" LCD touchscreen and voice-prompted navigation. It also comes with maps of the US and Canada pre-loaded on its memory card, with 1.6 million points of interest (gas stations, hotel, ATMs), MP3 player, photo viewer, and more. New Google Checkout users can get an additional $10 discount by signing up and paying via that service or first-time Buy.com users can activate this $5 off $100 coupon. Shipping is free and there is no tax (except CA, MA, MD, TN).