I buy and shave with super cheap Walmart brand Equate double blade disposable razors. You get a bag of 12 razors for about $2. They do a good job and I get a bunch of shaves out one razor. A couple of bags will get me through a year or more for $4.
I use those too, but I go one better. I save scraps of bar soap, toss it in a cup and use a shaving brush. Worked for my dad so I just followed his example.