I have the ultimate place for you to get almost all the feathers you're looking for in the US and fairly cheap. Can you say EBAY?!?!?!?!. I bought 3 pkgs of jungle cock for $40. Each pkg had about 100 medium/large jungle cock naiils. Alot cheaper then paying the 60 cents a piece youu'd pay in Cabela's. Youu'll find alot o US guys posting this stuff too. Found one guy who's selling alot of rare exotic feathers on there, but he's iin Singapore and kind of shady. So far Ii've been pleased with everything Ii've bought. Just make sure you see a picture FIRST!!! If you can't see the product you may not get what you paid for.
Hope this helps
"Good angling ethic is not a monopoly practiced just by fly fisherman" - Bill McMillan