newegg offers the Macally DUALSYNC Retractable Sync & Charge Cable For iPhone / Micro USB (pictured) for $14.99. This $14.99 mail-in rebate cuts if to $0. With $1.99 for shipping, that's the lowest total price we could find by $15. It features a micro USB to USB charging and data sync cable with an Apple 30-pin adapter, making it compatible with most smartphones including iPhones.

Of note, newegg also offers the Macally POWERPAL USB Travel AC Charger / Universal Power Adapter for iPhone / iPod for $14.99 before the above rebate, $0 after. With $2.99 for shipping, that's the lowest total price we could find by $9. It includes interchangeable plugs for various world regions and a 30-pin to USB charging cable. Both deals end June 12.