If you want to transfer files between devices, an SD card can do the job in a pinch, but not all are created equal. They all vary in speed and capacity, so you have to do your homework and consider your use case before purchasing.
If you’re looking for an all-rounder offering excellent bang for your buck, consider the SanDisk Extreme Pro. For a limited time, this 128GB SanDisk SD card is on sale for $24.99 (regularly $31).