As one of its daily deals, Amazon offers Prime members the SanDisk Ultra 64GB USB 3.0 OTG Flash Drive, model no. SDDD2-064G-G46, for $18.39 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $8.) That's the lowest total price we could find by $19. It features transfer speeds of up to 130MB/s and allows you to transfer files from your OTG-enabled Android mobile device to your computer.

It's also available in a 32GB version for $11.99 with free shipping for Prime members. (Once again, non-members can spend $35 to bag free shipping; otherwise, shipping adds $8.) That's the best price we could find by a buck, although most stores charge around $30. Both deals end today.