Amazon: http://www.amazon.com/gp/product/B003983I1S
has Gillette Fusion ProGlide Power 8-pack Refill Cartridges for $19.12
when you select "subscribe & save" (on the right side of page). Shipping is
free.
You may cancel subscribe & save any time after your order ships
Item(s) Subtotal: $22.49
Shipping & Handling: $0.00
Promotion Applied: -$3.37