Hisgadget via Amazon offers the Intocircuit Power Castle 11,200mAh External Battery Charger in Gray or Silver for $22.99. Coupon code "BNZ58Q2H" cuts it to $17.99. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to bag free shipping; otherwise, shipping adds $6.55.) That's $2 under our January mention and the lowest total price we could find today by $7. It features a 2.1-amp USB port for charging tablets, a 1-amp USB port for charging most cellphones, LCD display, and travel pouch.