I got mine off of Ebay, though when I checked today, I did not see a listing from the seller. He usually sells them by the 100 in 2 different qualities. I bought the lesser quality ones for under $20. They were good feathers. These are whole feathers, BTW.
If you are looking for cut feathers, or whole, but trimmed at the base, I go to Eders.com.
Goog