For new Rakuten Shopping customers only, Supply Warehouse via Rakuten Shopping cuts up to 36% off a selection of Gillette Razor Blades. Plus, take an extra $13 off via coupon code "TREAT4U", dropping prices to $17.99. Even better, they all qualify for free shipping. That's the lowest total price we've seen for these razor blades. Coupon expires July 21. The deals: