I picked up a Toko (that's right Toko not Toyo) wooden field camera real cheap at a local camera store. The lenses I mainly bought on eBay, again really cheap. I would think a good beginning kit should cost you around $500-$750usd. You could get away with old Graphics etc. but you will end up buying something better sooner or latter and then that money would have been wasted.

Contact Greywolf, I believe he still has a PrinzDorf 4x5 for sale relatively cheap. He's a good guy and I've seen the camera. It's in good shape.