I dont know how creative you are but you could always buy seperate LEDs in bulk (ebay has tons of colors and vendors selling bunches of LEDS) I personally bought 1000 Blue LEDS for less then 10 bucks with shipping. If you know how or know someone that can, solder up your own LED light source.

Ive done this before but with battery power and waaaaay less LEDs involved so i couldnt tell you whats involved to supply the right amount of power. And I am a very new grower in the process of research and building my own LED light source for a small contained grow area. but it is a thought to cut down on the immediate price of LEDs. Radio shack also sells LED bulbs seperately but I believe its a bit more pricey then ebay. hope this helps you, or anyone else