Inspired by Martha's MSW cover, (and given that I couldn't master caWe ordered the butterflies for our wedding cake through Floral Trims. I also got pheasant feathers for my bouquet cheaply through them. The florist wanted to charge me several dollars per feather. The local craft store was no better. I think I got a dozen from FloralTrims for a few bucks. These are great for a number of DIY wedding projects. Just off the top of my head you could use them to decorate your wedding cake, as an embellishment on DIY favors, as DIY napkin rings, in your hair, the possibilities are endless.
Check out their butterfly and bird sale: