This deal has ended.
Buy.com has Kingston's 1gb USB DataTraveler drive for $19.95 after a $5 rebate valid through 6/24/06. This is near the lowest price I've seen. Two things: this is not blindingly fast if that is important (6MBps is not slow either, just average) and the concept of a $5 rebate is a little inefficient. Shipping is free and there is no sales tax outside of CA, MA, MD & TN.