I stumbled upon 128GB USB thumb drive selling at eBay at very low price, between SG$30 to SG$50 .
Check on some stores in Sim Lim Square or HWZ, price of a 16GB USB thumb drive is around S$30. So, mathematically, a 128GB USB thumb drive should cost more than S$300.
Quick search found that all cheap USB flash drive sold at eBay are FAKE.
If you often buy thing at eBay and if you found something a little too good to be true, then probably is not true.
After observed those fake listing for awhile, I notice that most of them started from very low price, for example, $0.99 inclusive with free shipping. When someone started to bid on the items, the price can go up as high as $50.
Be sure read the feedback ratings and do more check bidding before buying those fake items.