Amazon.com: Gomadic Hot Sync and Charge Straight USB Cable for The Garmin Nuvi 300 300T – Charge and Data Sync with The Same Cable. Built TipExchange Technology : Electronics
TRAMsoft - GARMIN Nüvi 300 Series (english)
3rd Generation Powerful Audio FM Transmitter with Car Charger suitable for the Garmin Nuvi 300 300T - Uses Gomadic TipExchange Technology
Garmin NUVI 300 Replacement Battery | Battery Mart