621407 RGB LED from farnell.co.uk - it has two blue elements and you can ignore the green if you so choose r. edit: £4.64 btw
wow thats high, i can buy 2600mcd blue 5mm for under $3 so why go with bi-color leds with the same color on both sides?
lol you can get 2000mcd blue leds here for just over £1 too... things are more difficult when you want more than one element in the LED. As for making one - a good idea! Farnell sell 2 - 1 light guides so you could pop a reb and blue n the two inputs and have a high intensity mixed output, though it does take up a bit more space... Cheers, r.