MacMall offers the i-Rocks AC USB Travel Charger Adapter for iPhone and iPod, model no. IR-1050, for $5.99. This $9.99 mail-in rebate yields a net profit of $4. With free shipping, that’s tied with our mention from a month ago as the best deal we’ve seen for such a travel adapter. (It’s a current price low by $10.) It’s compatible with iPhones, iPods, and most USB-equipped devices. Rebate expires March 31.