Old folding cameras with trashed bellows have proven to be an interesting source of lenses for me. I've gotten several at antique shops for $5.00 or so. One lens from a Kodak Premoette Jr, with a focal length somewhere around 100mm, ended up on my RB67 (I used a body cap as a lens board); it's almost as good as my 127mm f/3.8 (non-C) Mamiya-Sekor. Another is a Bausch & Lomb Rapid Rectilinear, about 180mm (?) that came off a Kodak Autographic and covers 4x5" film, or even 8x10" (@300mm?) with the front cell removed. Admittedly these lenses have pretty simple shutters, the ones I've seen have Kodak Dakon or Kodak Ball-bearing shutters and the speed ranges are basically 1/25th, 1/50th, sometimes 1/100th, and T or B. Anyway these lenses all cover 6x9 or larger depending on the camera.