If you want something heavy, solid, and pretty - no, beautiful.... go to a countertop shop that makes their own out of quartz/granite/marble. They typically have "remnants" or leftover pieces from larger jobs. Since you only need something like a square foot or two, you might get something really stunning for $100 or so. They will cut it to size and polish the edges.
We just had our bathroom vanity top done in remnant quartz for less than what corian normally costs. I asked him about making a couple of pieces for amp stands and got two beautiful granite pieces. I'm either going to make stands that will straddle my two 12" subs or I'm going to put them on top of the subs with layers of cork and neoprene between the granite and subs for vibration absorption. I'd like to find a way to measure the vibration though. These are tube amps, so I think vibration control would be more critical than it would with SS.
. . . . . . . . . . . Peter