For in-store pickup only, and with stock varying by location, Best Buy offers two Insignia 5,200mAh USB Portable Battery Packs in Blue, model no. NS-MB5200B, for $4.99. (Add two to your cart to see this price.) That's $20 off list and the lowest price we've seen for one, let alone two. (We saw one for the same price last week.) It includes a 2-foot micro USB cable and features built-in cable management.