https://en.wikipedia.org/wiki/Multi-level_cell#Single-level_...
Example suppliers:
https://www.micron.com/products/nand-flash/slc-nand
https://www.cactus-tech.com/resources/blog/details/why-slc-s...
http://www.macronix.com/en-us/products/NAND-Flash/SLC-NAND-F...
https://business.toshiba-memory.com/en-us/product/memory/slc...