Face Book is also a great place to find new and used discs. There are many disc groups with the Disc Golf collector group at over 10,000 people. The group I like best is the Frisbee collector group, it was gone from 150 to 900 people in the last year! There you can find many old school collectors, on line and brick and mortar store owners. You will also find the most informed group of people on Frisbee anywhere.
If you want to find that special disc that you have not seen since you were a kid, between Face Book and E Bay it is only a matter of time. For that really rare and hard to find discs you will at least get to know some one that has it! Lots of these people like to trade so keep that in mind. Good luck on your search and be sure to contact me could be I have a extra!