Tell him he can have them for a buck each if he takes twenty or more, less than that, two bucks each. We are selling ours at a Ren-Fair for twice that, but that's a different crowd, way different.
We sell most train feathers $1-$1.25 each for colored ones, and $2-$4 each for good clean whites. Blue neck feathers $10 for a bag of 20. Wings are sold to fletchers and regalia artists as well as feather painters, smudgers and costume crafters. I have a whole list of regular customers who return year after year to purchase. Our birds pay for themselves with feathers alone.