With availability limited by ZIP code (for some items), and for in-store pickup only, Best Buy offers a selection of Dynex Cables and Charges, with prices starting at $1.25. A couple of best bets:
Dynex MFi-Certified Lightning Cable Car Charger for $1.87 (pictured, $13 off)
Dynex 2,000mAh Portable Battery Charger for $2 ($6 off)
Watch this video and learn how to revitalize your car on the cheap by following a few tips.