Where to buy MDF board?

Rspark, Lowe's carries MDF. Or you can get a Sanus Euro rack (MDF). However, in your price range you can get a much higher quality rack. I'm thinking of getting a Critical Mass rack from Rainwater Audio. It was used in some high-end rooms at T.H.E. Show in LA this year.

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

Home Depot sells 3/4 inch MDF in a size that works perfect when they cut it in thirds. I don't recall the dimensions exactly but I built a nice, inexpensive rack for my daughter's dorm room. One piece of MDF, four 36 inch sections of all thread, some nuts, washers, paint and you're ready to go. Way less than $50.

look at the VTI racks at racksandstands.com

Less than $500 and look great!