It doesn't help that the flash manufacturers seem to be colluding on price and want to keep the cost of SSDs artificially high. Gotta make those margins! See recent DDR4 pricing issues for an example.
https://www.amazon.com/Silicon-Power-Endurance-Free-download...
https://www.amazon.com/KingDian-Internal-Solid-Desktop-Lapto...
And, if you spend a little more, SanDisk will sell you a 120GB for $64: