Amazon has the Amazon Basics 3-Blade Motion Sphere Razor w/ 20 Blade Cartridges on sale for $14 - 15% off coupon (check "Save an extra" box, eligible on first S&S order for this product) - 5% off with Subscribe & Save (can cancel anytime) = $11 with free shipping on $35+ or with Prime. That's less than 60 cents per cartridge.