BuyDig.com has the Garmin nuvi 3750 4.3" Portable GPS Navigator for $289 - $30 off with coupon code c20109187827 [Exp 11/8] = $259 with free shipping. The new nuvi line features a thin profile less than 9-mm thick, multi-touch glass display, landscape/portrait modes plus the usual turn-by-turn directions, lane assist with junction view and pre-loaded maps of North America.
iOink
Need to come-down to the ~$150 range like the other GPS models to be competitive.