I love the Mach3 razors but their blades are like 25 dollars for 12

Any alternatives ? I bought an electric razor but Im sorry it doesnt come close to a blade...(panasonic vortex)
How many shaves do you guys get out of one blade ?
I remember seeing somewhere about the CVS shaving stuff. Do you have a CVS where you live?
I get about one week out of each blade. Make sure that your blade is dry before putting it up and it lasts another shave or two. They are the best.