Amazon offers the Gillette Fusion ProGlide Power Razor Cartridge 8-Pack for $16.89 via the directions below. With free shipping, that's better than our Black Friday week mention (which saw a 6-pack for a buck more) and the best deal we've seen for this quantity. (It's also around $12 less than what you could expect to pay in your local store.) They feature five blades and a precision trimmer on the back for edging. To get this deal:
Step 01: View the Gillette Fusion ProGlide Power Razor Cartridge 6-Pack for $24.09
Step 02: Clip the $6 off coupon under the item's price
Step 03: Add it to your cart via Subscribe & Save for a final price of $16.89

Be sure to cancel Subscribe & Save once your order ships or you'll be billed for subsequent shipments.