Wow- it (the #5 cirkut) went for that much? That is a lot. I couldn't go to completed items for some reason it look. Has the auction site turned off completed items search? I got mine for $1200 complete and working a few years back.
On the #4 panorams, you could probably use 4x10 film and use them as a single shot camera. Don't know if you need to trim it or not. I've used 7x17 sheet film for my al vista 7F with good luck, even though I only get a shot at a time.