Available for in-store purchase only and with prices varying slightly by ZIP code, Walmart offers the Auto Drive 2,200mAh Portable Battery Pack in Black for $1. (The link is for reference only; you must purchase this item in-store.) That's a buck under last week's mention and the lowest price we've seen for any 2,200mAh power bank. (It's the best deal for an Auto Drive model today by $4.) It features a 5.9" charging cable.

Note: Readers mentioned during our last posting that this item is sold in the automotive section.