Amazon offers Prime members the SanDisk 16GB Ultra Fit USB 3.0 Flash Drive, model no. SDCZ43-016G-G46, for $6.85 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, it adds $8.02.) That's the lowest total price we could find by $4 and among the least expensive 16GB USB 3.0 flash drives we've seen without rebate hassles. It features read speeds of 130 MB/s.