Ebay is running a 15% off coupon (PMEMDAY) for select merchants, which includes Dell.
Dell has the Samsung 860 EVO 500GB drive here for $114.50 after coupon.
Also offered is the Samsung 860 EVO 1TB here for $229.50.
Worth mentioning is also the Samsung 860 PRO 1TB, but the discount is capped at $50 with this coupon, so the price only drops to $379 AC. Link
Not the very best prices going, but for a top quality drive, I think it’s a warm deal.
Good luck!