This deal has ended.
Buy.com has the Navman iCN 520 in-Car Portable GPS for $314.99 after our $15 off coupon. Type the destination on the touchscreen and it will display the best routes while giving voice instructions. The system includes a CD with North American maps for download and a 256mb memory card. Shipping is free and there is no sales tax (except CA, MA, MD, TN). HSN.com clocks in at an almost-double $614 for this, though other stores have it for $350-$400.