You can purchase packs of ONE-HUNDRED blades, or 200 cutting edges, for less than 20 dollars. If you keep the blades in a dry area, they are likely to last. I'm not even sure how long 100 razor blades would last for. Well over a year. This is a great option for the person that wants a "fresh out of the box" shave every day. Or perhaps the person who is really destined to save money.
Like I said, these are the blades most commonly used in a barber shop. They are stainless steel, have a polymer coat which delivers a great smooth cut. They are a great deal . There's a link at the bottom of the page for an amazon site that sells them, they're 50% off.