3rd Generation Powerful Audio FM Transmitter with Car Charger suitable for the Garmin Nuvi 300 300T - Uses Gomadic TipExchange Technology
Amazon.com: NewPower99 Battery Replacement Kit with Battery, Video Instructions and Tools for Garmin Nuvi 300 : Electronics
Classic Straight USB Cable suitable for the Garmin Nuvi 300 300T with Power Hot Sync and Charge Capabilities - Uses Gomadic TipExchange Technology - Walmart.com
Garmin nuvi® 350 Portable navigation system at Crutchfield
Amazon.com: Ramtech GPS Car Suction Cup Mount and 65mm Diameter Dashboard 3M Adhesive Disk Pad Replacement Mounting Kit, Compatible with Garmin Nuvi 300 310 350 360 370, SCDSK : Electronics