Amazon Warehouse Deals is offering 20% select open-box Samsung Evo 850 SSDs. Product condition and prices vary from "Used - Very Good" to "Like New". This is rated 4.8 stars out of several thousand reviewers. The 850 version actually has slightly better performance than the newer 860 version, based on a benchmark comparison by UserBenchmark. I picked up three myself and all arrived in better-than-described condition. Discount taken off at checkout.
Prices is $120.24 for 500GB "Like New". Also available in 1TB "Like New" for $252.06.
Available Quantity Unknown:
Amazon appears to be trickling available quantities in gradually. For example, the 500GB showed only 3 "Very Good" condition ($113.56) in stock last week, but then showed 19 "Like New" in stock immediately after the last one was sold. As of this morning, it does not give a limited quantity warning.
Follow these steps to get discount
1) Follow deal URL
2) Choose desired capacity
3) Scroll down and click on Used and New
4) Select any listing with the Amazon Warehouse Deals logo and displaying the message "20% off. Discount taken at checkout." below the price (See screenshot)
5) Add to Cart
6) Proceed to Checkout to see discounted price