Where to get very small USB drives?

The other day I go downtown to J&R because I thought if I would find them anywhere it would be there. I needed 2 USB drives..one 16 gig and the other one the smallest available. I only needed a couple megs at the most. The smallest it seems you can buy now is 8 gig.

A floppy disk would be fine for this purpose but we don't use those anymore, and floppy disks are big, and so is the external drive that I would have to have.