My daughter recently asked to raid my hackle bins for some lengthy rooster feathers for extensions to be crimped into her hair. She helped herself to a half dozen feathers. At about 3 feathers for $25-36 crimped in, I can spare the feathers, because of my OCD (Obsessive Consumerism Disorder)
I don’t doubt this fashion craze is of consequence for some shops and the beginning fly tier, albeit short term, I believe. It the hackle sources are jacking prices to the shop, shame on them. This subject matter is actually pretty stale, but you need to maintain momentum as a beginning tier.
So, my advice to the beginning tier, ride out the fashion craze. Tie wets, flymphs, nymphs, emergers and streamers. Tie anything that doesn’t require the premium dry fly hackle. Fish them and catch fish.