shcifang via eBay offers the TOCCs 2,600mAh Power Bank Key Chain in six colors for $4.67 with free shipping. That's the lowest total price we could find by a buck and the best per-unit price we've seen. This key chain adds up to 10 hours of usable power.
You can now see the same credit information that lenders, insurers and landlords use to evaluate you. But you must know where to look if you want it for free.