Newegg offers the Luxa2 EnerG 10,000mAh USB Portable Power Bank in Black, model no. PO-EG2-PC10BK-00, for $21. This $15 mail-in rebate cuts it to $6. With $2.99 for shipping, that's a buck under our October mention, the lowest total price we could find by $13, and tied as the best price we've seen for any 10,000mAh power bank. It features 2.4-amp and 1-amp USB ports and four-point LED status indicators. Deal ends February 29.