Way too many listings at Supplier Blacklist involve scams targeting buyers of SD cards, micro SD cards, Flash drives and USB drives. China Sourcing Information Center did a white paper on the subject. Find here some of their key points!
I placed an order for 1000 pcs 4 GB micro SD cards at Shenzhen SenTone Electronics Co. As per long discussion Shenzhen SenTone Electronics Co., Ltd committed to send the full capacity card. But when I received the parcel from DHL, I found only 200 cards which where upgraded and did not have full capacity.