I tie a lot of winged wet flies. I don't feel most of the materials are that hard to find. Mallard quills of different colors are pretty easy to find. Mottled turkey is fairly easy to come by these days. Most of the other wings are mallard flank, wood duck flank, or teal. Mallard flank is cheap. Wood duck flank is pricey but not terrible. I buy it to make the wings on Catskill dries. Whatever is left over from each feather, I use for the wings on wet flies. You can also buy mallard flank that has been dyed to the wood duck color. Not quite the same but not bad either. Some tiers even prefer it on wet flies.