Amazon has the Silicon Power A55 M.2 2280 256GB SATA III Internal Solid State Drive (SU256GBSS3A55M28AB) for $30 with free shipping. Has excellent Amazon Reviews.
Amazon has the SanDisk 64GB Dual USB 3.0 / micro-USB Drive (SDDD3-064G-G46) for $11 with free shipping on $25+ or with Prime. List price: $15. High-speed USB 3.0 performance with read speeds up to 150MB/s file transfer from drive to computer. It's compatible with PCs and Android devices.
Has above average Amazon Reviews.
Amazon has the Silicon Power 256GB 3D NAND SATA III 2.5" Internal Solid State Drive (SP256GBSS3A55S25) for $29 with free shipping. Has excellent Amazon Reviews.