Daryl,
I got a call back from the company that makes the 'hat block' that sells at MCSS'. The company that imports the mesh that they use is Carr Textile (http://www.carrtextile.com/Pages/default.aspx). You can reach them at 800-432-6620. I think you're probably looking for the PB81 mesh, which comes in a variety of colors! (http://www.carrtextile.com/Pages/MeshPB81.aspx)
Let us know how it turns out/if they'll sell small amounts to you!



