newegg offers the Kensington PowerBolt Car Charger for iPhone in Black, model no. K39243US, for $11.99. This $10 mail-in rebate cuts it to $1.99. With free shipping, that's tied with our January mention and the lowest total price we could find by $12. It's compatible with iPhone 3G/3GS, iPhone 4, and iPod touch. Rebate expires April 1.

Update: The price has since dropped to $10.99 before rebate, 99 cents after.