I saw a great deal on this xiaomi quick charge 20000mah powerbank at dealabs (French bargain site), and was going to post it before I remembered that we have our own Geekbuying rep here, clear. After some negotiating with him, I managed to score another $1 off, enter code 'LylXiaomi' before checkout. Lowest price you'll find anywhere, and $5 cheaper than the previous lowest posted on ozbargain.
Specs:
Type: Power Bank
Battery Type: Lithium-ion battery
Capacity: 19020/20000mAh 68.47/72Wh MIN/TYP
Input: DC 5V/2A 9V/2A 12V/1.5A
Output: 2*DC 5.1V/2A MAX 3.6A
Temperature: Charging temperature: 0 - 45 degrees(TYP)
Continuous output temperature: -20 - + 60 degrees(TYP)
Weight: 338g
Product Size: 141.9 X 73 X 21.8mm