The Schick Quatro disposables are a good product and have a surprisingly long life-span. They come in a package of three and are occasionally on sale at the usual places.
When I was still in uniform, I had to shave twice a day with those multi-blade razors. They only lasted a couple days.
I have found that if you store your razor in a glass jar filled with high octane rubbing alcohol, with enough in it so the blades are submerged, the blades will stay sharp for much longer and it also will sterilize the razor. Needless to say any other high octane alcohol will work just as well, but I much rather drink it than waste it. I have no idea how come it works, but it sure does as it allows me to shave with the same razor for several weeks.