Samsung M.2 SATA 500 GB 860 Evo @ MightyApe for $101. Looks like the cheapest for this product according to Pricespy.
A good choice if your motherboard has got "enough" M.2 slots, and not a fan of too many power/data cables in your build.
Please note it is not the faster PCIe version.
Looks like the deal will expire tomorrow noon.
Damn good product & price. Paid $137 during NY special.