Where to get Keyboard Trays?

[Spaceninja]

So looking around the internet I am trying to find a good place to get keyboard trays from. I like this one http://www.techforless.com/cgi-bin/tech4less/KCS69575?id=HQoi3TDA&mv_pc=331. However I do not like the price. I checked Monoprice hoping they had a something but alas they have nothing. So anyone have suggestions on where to get something like this on the cheap?