coupon code: SBTPB357
Free shipping w/ Prime.
Store4PC via Amazon again offers Prime members its Sabrent Ultra-Compact Portable Battery Charger, with 3 different sizes
2200mAh original $18.99 after coupon $8.99 http://www.amazon.com/dp/B00GUL22VS
4400mAh original $22.99 after coupon $12.99 http://www.amazon.com/dp/B00GULENEC
6600mAh original $28.99 after coupon $18.99 http://www.amazon.com/dp/B00GULOW3Y
Coupon code "SBTPB357" gives you 10$ off
(Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs will add)