$10 is a great price for a 5,000mAh power bank even without the wireless charging.
Brad's Deals Editor Michael,
The Sony CP-W5 5,000mah Wireless Portable Charger for Qi Enabled Devices in hassle-free packaging drops from $29.99 to $9.99 with free shipping at Tech Rabbit. This is the lowest price we found for one by $10. When plugged in, you can use these as a regular wireless charging pad. Afterwards, you can unplug them and use them as a 5,000mAh power bank and recharge your phone by simply placing it on top. There is no sales tax (except NJ).