Best Buy via eBay offers the PNY 16GB Compact Attache USB Flash Drive in Black/White, model no. P-FD16GCOM-GE, for $4.99 with free shipping. That's $2 under what you'd pay in your local store and the lowest total price we've seen. It features a sliding collar, which eliminates the need for a cap.

Update: It's now available for in-store pickup only.