This deal has ended.
Buy.com now has a refurbished Magellan Roadmate 6000T GPS System for $339.99 after a $50 mail-in rebate valid through 5/15. This is not available new for under $500 and can run to $700-$800. In addition to pre-loaded maps and turn-by-turn voice and visual guidance, the 6000T has an intergrated receiver for live traffic reports and a bluetooth setup with speakers and microphone to answer your cell phone calls. Shipping is free and there is no tax (except CA, MA, MD, TN). New customers can use this $15 off coupon or new Google Checkout can get a $10 off discount (you can't get both).