Best Buy via eBay offers the myCharge Transit Plus 3,000mAh Power Pack
, model no. TR30K-A, for $14.99
. Opt for in-store pickup
to dodge the $2.99 shipping charge. That's tied with our mention from two weeks ago as the lowest price we've seen. (It's a current best by $10.) It features a fold-out car adapter and 2.4-amp USB output.