Look for an 8x10 monorail, particularly an older one. Monorails usually sell for less than a folding field camera and you might find a deal somewhere. My 8x10 Burke & James Grover monorail ended up costing, like, $100 after I sold off the stuff that came with it.
For inexpensive film holders, get some older wooden ones. Everybody else likes the newer plastic ones but the woodies are often lighter in weight and much less expensive and out of the 30 or so I've bought over the past few years, one had a slight light leak due to a cracked slide. Call Jim at Midwest Photo (www.mpex.com) and ask him if he can help. Sometimes there's older but perfectly usable stuff in the back room he can let go at a good price.