HisGadget Inc via Amazon.com has the
Intocircuit 13,000mAh 4.8A Dual USB External Battery Pack w/ SmartID Technology on sale for $29.99 – $15 w/ promotional code 1NEWDEAL = $14.99. Shipping is free with Prime or if you spend $35 or more.
HisGadget also has the Intocircuit 15,000mAh for $39.99 – $22 w/ promotional code 2NEWDEAL = $17.99. Shipping is free.