Amazon has the OXA Juice Box S2 10AH External Portable Battery Pack w/ Built in LED Flashlight for $21.99 with free Prime shipping. Coupon code S7D9DIKB drops it to $20.23 This is one of the lowest prices we’ve seen on a battery of this size with 2 USB ports (Output: 5V 1A & 5V 2A). This 4.4/5 star rated charger uses high quality Samsung batteries, has a flashlight and separate charge indicator and includes a micro USB/30pin/Lightning cable connector and a 1 year warranty.
Want something a little more portable? Amazon has the RAVPower 5600mAh External Portable Power Bank with Built-In Flashlight for $25.99. Coupon Code: AJTGLBHX at checkout drops it all the way down to $15.99 with free Prime Shipping (or it combines perfectly with the above to hit $35 free shipping w/o Prime). This has a 4 LED status indicator but one only has one DC 5V / 1A USB output so it will charge anything but iPads and larger items will charge slower.