Powerocks Stone 3 (7800mAh Dual USB Power Bank)
I got the Powerocks Stone 3, a 7800mAh dual USB power bank, from my cousin in Hong Kong. I'm unsure of the local price, but it's US$48.50 on Amazon. True to the 'stone' name, it's heavy at 500g.
Powerocks
Powerocks portable power banks and battery chargers.