For Shop Your Way Reward Members only, Kmart cuts up to 60% off a selection of Duracell USB and car chargers. Plus, each one receives 100% back in Reward points, making these items essentially free. (Not a member? It's free to join.) That's a very strong deal from Kmart, and assuming you use the points, yields significant savings on a wide range of items. Opt for in-store pickup to dodge shipping charges, which start around $6. A couple of best bets, with comparisons assuming you'll use the credit: