For this Microsoft Lumia 535, there are multiple places to purchase it. Not sure if it's available off-the-shelf. However, you can get it from some of the sellers on LYN in their respective threads. Lelong, SuperBuy, Lazada also carry it i believe.

Wanted to know whether anyone has experienced connectivity issues? I'm on Maxis and i am unable to receive any mobile data on the device, even though Mobile Data is set on.