As one of its daily deals, Amazon offers its Prime members the SanDisk 128GB microUSB USB 3.0 OTG Flash Drive, model no. SDDD2-128G-G46, for $29.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, it adds $8.) That's the lowest total price we could find by $9. 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 64GB for $14.99 with free shipping. That's $4 under our January mention and the lowest total price we could find by $5. Both deals end today.