In our experience, it always seems like you buy USB keys, but they just go missing at the most inopportune times. If you need a moderately sized USB key, Dell Canada is once again selling the 16GB Kingston DataTraveler USB Key (Gen 3) for $8.99. We see other stores selling it for $9.99 to $19.99, and unlike Dell, they don't offer the convenience of free shipping on such a small amount.
For some other offers, check out the rest of Dell Small Business Travel and Mobility Sale. Discount prices are valid through July 19.