newegg offers the Rosewill 2.1A Mini Car USB Adapter, model no. RCP-SC39, for $7.99. This $7.99 mail-in rebate cuts it to $0. With $1.99 for shipping, that's $7 under our May mention (which also included a cable) and the lowest total price we could find by $6. It features 2.1-amp output. Rebate expires July 25.