Amazon and Best Buy have the NVMe Samsung 970 EVO Plus in 500GB for $29.99. I use it for my Synology NAS and it works great.
Amazon
MZ-V7S500B/AM
https://www.amazon.com/Samsung-97…07M7Q21N7/
Best Buy
MZ-V7S500BAM
https://www.bestbuy.com/site/sams…Id=63244