Hey Britt, I am looking for some too! I currently have found the following online, just in case you're interested or if no one here is selling any. I'm not sure I want to spend too much $ on them, but I thought I'd share.
One of the Cheapest, but out of stock :~( : Capiz Curtains, Shell Curtains, Doorway Curtains, Party Garlands, Decor Strings
Another inexpensive one: Beaded Curtains, Faux Capiz Shells
Amazon.com: Capiz Door Curtain: Kitchen & Dining
Capiz Door Curtain : Target -> $62.99
Capiz Shell Curtain
Hanging Capiz Shell Curtains ~14 Strands~ Movie: Knocked Up (Out Of Stock)
Someone also mentioned they bought theirs from Cost Plus World Market, so I am going to try and look there too (as I only saw blue and white combo online)