Don't thinks that you can buy actual "iland" hair but any nylon hair that a tackle shop sell will work as good if not better. I get all my heads and hair from Joe Shutes fish finder tackle.
P.S. If you are going to retie a ilander (blue / white), use crystal hair instead of white hair
What was said aboce is 100% correct, use crystal over white, works 100x better, and Joe Shute's is one of the best places to order from, personally I'd junk the islander's and just buy his lure's, I pull them and they outfish my ilanders by a lot, gonna sell the 50 some odd ilanders I have in my lure bags and replace them all with Joe Shute lures, much better presentation and a better value by far. Oh and did I mention they catch fish...