Use a sound camera regardless of age so you don't waste materials.

So same advice for cameras as for lenses; get a good used example of a fairly modern camera. Figure in some maintenance costs depending on manufacturer, model, age, and usage. If you go vintage, figure on a bellows and a "tune up" by someone like Richard Ritter.

I just did this with a solid 8x20 Korona, and I'll have about $2500 in it including the bed braces, 5 film holders (3 Hoffman), back bail with new springs, extension rail, new bellows, Satin Snow GG, making sure all the screws were in sound wood, plus some other minor work. It was usable as purchased with lenses up to an 18" at infinity, but I wanted a bit more flexibility to use longer lenses or closer, and the old bellows, while light tight, was quite stiff.

You could certainly get into ULF for considerably less, but I didn't want to have to fight with the equipment and the camera cost is small compared to consumables. 25 sheets of Ilford 8x20 will run about $230 and a box of paper about the same (although more sheets), so it seems rather "unbalanced" to worry about trying to save comparable one-time costs in the camera, especially when camera problems cost you a lot more in wasted materials that can be hard to get.