If your phone has a microSD slot (which is quick becoming a rarity), you might want to check out the SanDisk 400GB microSD card. It started at a hefty $230, but you can now have it for $190.
B&H Photo Video, Amazon and NewEgg have it at that price. Best Buy is charging $200.
There are smaller cards too, the 256GB ones start at $100 if you don’t need so much storage (there are faster, pricier versions of the 256GB card too).
The 64GB and 128GB cards get you the most bang for your buck, we did the math:
Capacity
Price
GB/$
16 GB
$9.90
…