Well, if you have a good chunk of space you can clear off (I'd say probably a minimum of 24 x 36 inches, you can make your own printing board which can be stored away when not in use...then you just need to worry about getting screens and whatnot. It's kinda an investment but you can be thrifty about it, and not break the bank.
Otherwise I wouldn't have all the crap I have for screen printing. I definitely don't have tons of money for fancy toys and whatnot.
When I am printing I just use my work bench, I definitely need to start doing some screen printing, I did it years ago with simple paper masks, but I did buy some emulsions, I just need to use them, But I would like some kind of proper registration set up...plus of course a few screens!
A very economical way to make screens is to buy canvas frames. I rip out the canvas bit and then use the wooden frames for my screens. If you don't want to shell out for real screen printing mesh, I've used fine organza fabric before and it works pretty well as a cheaper substitute.
Then you just need a staple gun, staples, and duct tape.