Amazon.com: SanDisk Ultra 128GB microSDXC UHS-I Card with Adapter, Black, Standard Packaging (SDSQUNC-128G-GN6MA): Computers & Accessories. Storage keeps coming down in price, and you can add 126 Gigabytes to your phone or other device for around $43. I can remember the days when you paid more than that for a box of floppy disks. At 720k per disk, you would need around ten thousand boxes to have equivalent storage capacity. Amazing.