Got this from Qoo10 and the quality seems good. Might not be cheapest as you source around other online site but at least is convenient, safe and you don't need to wait long to receive it. (i once waited 1 and the half month for third party battery from ebay, story here). The price will probably fluctuate a bit but i got it for SGD 5.2 and after utilizing my 100 q-points, got additional 1 dollar discount.