Well... It's nice that you got what you wanted.
I have to add that part of collecting is in the finding. If every knife were on the shelf at some electronic "store" then all knives would simply be is a price tag.
Rare or Vintage- New or used, some knives are more difficult to obtain. That is just what it is. Life!
I'm going to look more into the WTB threads here. It's a good place to start. As good as any, anyway.