Im not sure if there is a site like that. You could always check ebay, but it would probably take a lot of time to sort out what you need.
You might ask forum member UnknownVT as well. He seems to know quite a bit about SAKs including older ones.
Also check over at Knifeforums in the SOSAK forum. Lots of good SAK users and collectors there.
Post some pics as well, that might get some of them ID'd for you.