every radio shack i've been to has a big case with drawers that slide out, in the electronics area. they are in one of those drawers. LEDs. i'm not sure they sell blue tho. i know i had to order mine off the net, but i have the pigtails attached because my case doesn't have sockets for them. if you look in the cases & cooling forum there should be a stickied post with places to get case modding stuff. most of them stock LEDs of all different colors.