Here is Dan's list of store brand products that can be used for The Regimen. http://www.acne.org/supplies-guide.inc.html
My only suggestion here is to be careful. I have used some potentially decent cleansers, but some of them (even the non-beaded ones) can really strip your skins natural oils.
My wife has some cleanser that she got at Walmart with a green cap, but I absolutely can't remember who it's by. I'll have to check for you, and then get back to you. But if you can, try to stick to Dan's Regimen.
I personally use Olay's foaming cleanser for Combination skin and I can't imagine the day I have to move on from it. I just love it! The bottles are all a little different, they're blue but one has pink, one has green, and one has purple coloring. I use the purple one and it'll say "for Oily/Combination skin."
It controls oil all day long!