I spent the last 3 months looking for a low wall action for a project and they were tough to find. Original low walls really bring a lot of money. What I found mostly that I could use were entire guns that had bad bores or other problems, but even these were really expensive. I found some on Gunbroker and Gunsamerica and there is a classified section on
http://www.assra.com/ that you can find actions sometimes. I eventually gave up (when I saw an original low wall with totally rusted bore, cracked forend and buttstock, no tang screw, smashed sights and the whole thing had been re-blued at one time and it got bid up to $577 and still didn't meet reserve) and bought a brand new Uberti Low Wall that I will re-stock and rebarrel if I don't like it as is. I have a Uberti High Wall that is a very nice gun also. Good Luck in your search.