I know that Samsung is going to drop a big ol’ 512GB microSD card on us, but SanDisk’s already-available 400GB card just dropped to its lowest price yet (well, outside of Prime Day). Originally $250, Amazon dropped their price on it to $150 today.
This particular card is a SanDisk Ultra 400GB with an A1 rating for Android apps, 100MB/s transfer speeds, and all the class ratings you expect in a high-end card. This is the big boy you need if you need massive amounts of storage.
Amazon Deal Link