Where to buy MDF board?

Thanks for all your suggestions. I left a message with Rainwater Audio to find out what their prices are (found their website-criticalmasssystems.com). But people seem please with the Sanus euro--but I don't think the tubes are fillable with sand or lead shot. Any other experience with the Sanus sand would be appreciated, Thanks, Richard

Did not realize MDF was so easily obtained. Thanks for your suggestions about racks I might consider as I was not certain building one is the way I want to go. Any more suggestions about material/racks would be appreciated,Rspark

One suggestion was a Critical Mass rack from Rainwater audio...I searched the web and could not find a site. Can anyone help me with a way to a site (or any other rack suggestions) Thanks, Rspark

With respect to my not trying to make a stand because of lack of know-how, I certainly think I could manage it (my other hobby is building rustic furniture). But sounds like the efforts may be offset by the possibility of building a wobbily rack. Still looking for a possible rack to buy...could afford a critical mass rack but really do not want to invest in the platforms that sound like an integral part of that design. Am still uncertain and would welcome suggestions.