The TomTom XL 340 S 4.3-inch touchscreen GPS navigator with preloaded maps of the US, Canada and Mexico along with text-to-speech technology, traffic compatibility, and easyport mount is available at JR.com in refurbished condition for $88.97.  That's a price drop of $46.02 off the original price of $134.99.  Even after the $2.95 standard shipping fee this is still the lowest total price we have seen on this GPS by about $14.  Sales tax applies for residents of most states.
 

PCNation.com has the similar Garmin nuvi 265T automobile navigator for $166.90 with FREE shipping.  The Garmin nuvi 285W 4.3-inch GPS navigator with Bluetooth and traffic reports is available at Amazon.com for $130.68 with FREE super saver shipping.  BestBuy.com has the LG LN740 portable GPS, which was priced at $449.99, but has been cut by $270 to $179.99.