Newegg offers the ADATA DashDrive UV128 16GB USB 3.0 Flash Drive 3-Pack, model no. AUV128-16G-RBE, for $15.99 plus $7.49 for shipping. That's $7.82 per drive and the lowest total price we could find for this quantity by $5. Features include read speeds up to 40MB/s and write speeds up to 15MB/s.

Update: Shipping is now $2.88.