Cheapest approach would be to purchase a ready-made unit at Office Max or
similar.
Several of the Woodworking suppliers have them as a specialty item -
accordingly-priced.

"Tom Friar" wrote in message
...
Hi, just wondered if anyone could help me out. I'm making a desk for my
computer. I want to make a slide-out shelf for the keyboard that locks in
place at it's maximum extension. Does anyone know what sort of drawer
sliders id need and where I could get some?

Cheers