Where can I find long feathers?

For my sculpture class, I’ve decided to made a Venetian / Carnaval looking headdress. It calls for long peacock or regular feathers. My teacher says she doesn’t have any and is requiring me to get them myself.

I know I could easily just change my concept, or just a whole new headdress but I love Carnaval so much, my sketch is beautiful and I can’t really think of anything else.

I looked at the Michael’s craft store site and they’ve got nothing of the sort, so is there any place that sells feathers for something like this? I can post a link of my sketch as well if that’ll help. I just really want these long feathers.