One of my favorite online store will definitely be TLA. 

I have been shopping with them for a couple of years now. They have a wide variety of choices and some are hijab friendly too.

The only down side of this online store is their reply. It takes a while for them to reply on your inquiries. But they will definite ship your item but it might take weeks. Majority of the choices are pre-orders. Their prices start from as low as RM18.

TLA also provide bulk orders or wholesale.