Hi Tom,
I got a pair of rear quarter patch panels from Tabco (tabcobodyparts.com) for under $60 each. On the invoice they are listed as Rear Wheel Arch, part numbers 16751-L and 16751-R.
I don't mind pounding out dents or applying body filler, but I don't know how to weld, so I took my 240Z to a local body shop to install the patch panels. They turned out really nice. See the photo for how the passenger side looked.
I finished the rest of the body work and painted the car in my garage with PPG's Omni AU line of paint. A previous owner had the car painted red, and I repainted it with an orange basecoat followed by several layers of clearcoat. I'd never painted a car before, and figured that since I bought the car for $300 I wouldn't be out too much if I messed it up. Fortunately it turned out rather nice!
Kenny P.