Dieter- exactly! I know a lot of the vintage pen restorers and vendors often have pretty strict policies on selling parts like nibs, but I figured that it there must be *someone*! While I can imagine there can be a rather short supply of nibs for name brand pens, personally I'd be open to getting 14k warranted nibs that wrote OK. The other option would be to just start trolling eBay, buying various good brand pens that are unrestored from "not a pen expert" type sellers. That's how I got the Eversharp Skyline stub nib that I love and use in a frankenpen- but I still do have a perfectly fine Skyline-sans-nib left over- I even cleaned it up and resacced it. It seems a enough of a shame to reduce a full pen to parts to get a nib, but the idea of doing this many times is even worse. It might be most economical way, as far as I can tell. :/
The other option is to buy new nibs, but for gold nibs that is pretty costly, and there aren't all that many companies which sell just the nib. Especially for steel nibs. Maybe we'l get lucky and someone will chime in!

Aaron