Trashthrasher
Eagle Member
Largest selection I have ever seen in any store is Art Smarts Dart and Juggling Emporium in Milwaukee.
http://www.jugglingsupplies.net/
They literally have all the discs just scattered over the floor. Every make, model, and company, and odd ball discs. A little more pricey by a few bucks, but man you truly get a taste for what is out there.
Online I am a huge supporter of Prime now. Two day shipping and cheap prices. Can't beat em.
Art Smart's Dart Mart RULEZ!!! Tons of discs, darts, juggling supplies, joke stuff, YoYo's & other random oddball stuff... cool place really!!!