Buy.com has dropped the price of the 4.3-inch Pioneer AVIC-U310BT In-Dash Navigation Receiver (model no. AVIC-U310BT) by an impressive $442.67, which turns it’s once $700 list price into only $257.33 and makes it the best price available for this GPS system by about $5. FREE shipping is included with the deal and sales tax applies for residents of New York and California.

Tigerdirect.com this week is offering $140 off the TomTom XXL540S 5-inch Widescreen Portable GPS System, which doesn’t hold nearly as many features as the Pioneer, but delivers portability for users on the go and sports a five star customer rating amongst users. The TomTom GPS can be purchased for only $159.99 and has included FREE shipping. The Garmin nuvi 885T GPS Navigator with Speech Recognition technology, MSN Direct, and Bluetooth support is available today from Buydig.com ad priced at $266.47. If you want an even smaller GPS system than check out Buy.com for Bushnell ONIX400 Portable Navigator, which has been lowered to $89, and results in a $310 price drop from its original cost.

The TomTom XXL540S 4.3-inch Widescreen Portable GPS System features an integrated CD receiver with internal amp, built-in Bluetooth support for hands-free calling, and full iPod control without the need of additional adapters. In order to get around town the device offers maps for US, Canada, Alaska, and Hawaii. Users can also listen to satellite radio and Pioneer HD Radio through the system, and can attach a subwoofer via the 4-channel preamp outputs. Dimensions: 13.6” x 10.4” x 10.4”; weight 6lbs.