Adata via Rakuten offers the XPG 512GB SX6000 Pro M.2 2280 PCI-Express Gen3x4 Internal SSD for $99.99. Coupon code "AD15" cuts that to $84.99. (You must be signed in to your account to use this coupon.) With free shipping, that's the best deal we could find for this model by $25 and the lowest price we've seen for any 512GB M.2 SSD. It features read speeds up to 2,100MB/s and write speeds up to 1,500MB/s. Deal ends November 14.