All4Cellular offers the Macally USB Backup Portable Charger, model no. JBOXMINI, for $7.95. Coupon code "A4C10" drops it to $7.15. With free shipping, that's the lowest total price we could find by $23 and the best deal we've seen for such a Macally charger this year. (We saw it for $3 less last winter.) This rechargeable unit charges USB devices via its internal Li-ion battery. Coupon expires November 11.