There have been a few deals on here relating to Sandisk USB Flash Drives. However, there are other manufacturers other than Sandisk.
This Toshiba USB Flash Drive is almost half the price of an equivalent Sandisk flash drive posted here recently. It's being supplied by eBuyer with free delivery. As eBuyer are one of the biggest IT online retailers you can also be fairly certain that it's a genuine product, rather than a Chinese knockoff or fake.