I have no complaint about the cartridges (Harry's) I use. They cost on average $2 per and I get 4-6 shaves out of each. I shaved with them every 3-5 days for an average of $4 a month. I've seen, this morning, Voskhod blades for $8.98 per 100 on Amazon. which equates to 0.09 per blade. Shaving roughly every 3 days that's 10 shaves per month. If I used a blade, on average of 3 times, that's 3-4 blades a month, or $0.27 a month for blades. All of which adds up to saving $3.73 a month or $44.76 a year. Edit: Cartridge cost correction. & Add blade cost per month comparison.