Gillette On Demand offers the Gillette5 Men's Razor Blade 4-count refill [gillette.com]
for $7 after $3 discount for new customers and includes a free handle with first purchase. Choose one-time purchase when adding the item to your cart..
Add one or more additional Gillette5 Men's Razor Blade 4-count refill [gillette.com]
for one-time purchase to your cart on the same order and apply promo code BLADES50 to get 50% off each refill, for a cost of $5 each. (The refills without handle must be added from the product page; the quantity for the refill plus handle in the cart cannot be increased.)
Additionally, if you complete your profile [gillette.com]
before you order, you will receive an extra 5% off for a net cost of $6.65 for the handle plus blades and $4.75 for each additional 4-blade refill.
Existing customers will not receive the $3 new customer discount, but instead the 50% discount will apply to all items in the cart.