64GB Sandisk microSDXC (C10, UHS-I, U1, A1) for $20

The 64GB Sandisk Ultra microSDXC UHS-I Card with a full size adapter, a Class 10, UHS-I, U1, and with A1 designation (faster app performance), model SDSQUAR-064G-GN6MA, is currently on sale for $20 at Amazon by Amazon itself, defeating all the other storage sizes in the same line. You can buy as many as you like. This is not a lightning deal, so expiration time unknown. Free shipping for Prime or with a $25+ order.