Amazon is having a lightning deal on the lower (128GB and 256GB) capacity Adata SU800 drives for $18.70 and $36 respectively.
The 512GB appears to be on sale for $59.99, with no lightning deal there.
https://www.amazon.com/ADATA-SU80…B01K8A29
These SSDs have DRAM, a SMI controller and TLC Nand. THey use the same SMI controller but one generation older Nand than the Crucial MX500. Still a good buy for a premium SSD for system OS use.
https://ssd.userbenchma