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There are at least two options. You can buy the big packages for about $3 and sort through them. In a big bag, you may get about 10 really good feathers for a flat wing streamer, in a size 4 or 6. Option two is harder to find. Some good shops sell a small package of "premium" flank feathers, typically died in an olive or yellow color. The premium feathers are really nice.
If you are tying streamers, you can sometimes double up (overlap) two smaller feathers to make the profile of a larger one.
Yes, tying Zoo Cougars. Had such good luck with rainbows last week, they couldnt get enought of them. Would really like to get some good quality flanks. I have sifted through the large bags and I would rather pay the extra $ for really nice pieces.
Feather-craft sells them per feather and by the pair. I saw them on the site when I was looking for something else, so I can't vouch for them personally. I think they are natural color and $.10