Here are some options for buying leds

buy local, which I do for some when needed
http://www.rtbb.com.au/catalog/index.php?cPath=22_119&osCsid=67d0bb0710e6064257b6db61c3bc98e8


Overseas go to
http://www.cointaker.com (lifetime warranty)
http://www.pinballlife.com/index.php?p=catalog&parent=192&pg=1
http://www.niftyled.com


Found these today, along with some positive feedback, incredibly cheap
http://www.cometpinball.com/product-p/1ledbullet.htm

I have tried a few of them and my favorites are still the Noflix Plus series.. http://www.pinballcenter.eu/catalog/noflix-pinball-leds-c-22.html?language=english

Though I would say use the 'Noflix plus' not just the noflix, otherwise you get ghosting, and they don't roll on and off smoothly (more like strobes which is horrible IMO, that was my problem with the cointaker ones I have)..