You will not find prewired leds but you can find some from these following stores:
mouser.compheoptix.co.ukebay.comdigikey.comI have bought from mouser with no problem, I have recently bought from ebay for a very good price (however the leds have not arrived yet, only been a few days.) and phenoptix appears to have GREAT prices, and I plan to buy from there in the future. But other members of the forum have bought from all four of the listed places and all are quite reliable. One more thing: This has discussed many times, so next time you have a question, please use the search button, before you post a new thread. If you in fact can't find it, we will be more than happy to help you.