Amazon offers Prime members this CyberPower Retractable Cable Kit, model no. CPU3RTAKT, for $7.97 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.01.) That's the lowest total price we could find by $4. This MFI-certified retractable cable extends to 2.5 feet and features microUSB, Lightning, and 30-pin connectors.