You can build them for 20 bux. I built one with 10 lights for less than 20 bux. The led
's are .95 cents at lebos.com, you need a resistor for each one @ 5 for a buck at radio shack. If you get a 4.5 vdc power supply then you need 39 ohm resistors. I used a piece of birch paneling for the mounting strip but for my next one I'm gonna get a 1 by 6 rip it to 1 1/2 inches and groove out the middle with my table saw. The plywood wants to bow from the heat of the lighting fixture it's sitting under. HTH BTW
if you can solder 2 peices of wire together you can build your own.