Select 4-Pack Razor Cartridge Refills are now buy one get one free at Dorco. Plus they ship for free as well. Just add two sets of a type to your cart, for a total of eight refill cartridges, and the price will be adjusted automatically. Choose from eight refills of the pictured Pace Men's Cartridges for $7.15, eight Shai Women's Cartridges for $6.05, eight Pace Plus Cartridges for $9.65, or eight Shai Soft Touch Cartridges for $7.45. If you don't already have a Dorco razor handle you can get one here. Sales tax is not charged in most states.