Home Depot or Loews,
buy a 12x12 or larger or the size u need, slab of granite, or a piece of tile 2-3 inches thick, and done!
Cheap and is sturdy for a TT!
I have a recently new marble slab cut to perfection, at 15x15 for my SL-12OO mkII.
WORKS GREAT!
Or hit a home decor place like bed, bath n beyond and pick up a nice 4 inch cutting board (maybe 50-70$) for a nice one.
I use two 4 inch cutting boards which I sanded a little bit, stained then with cherry stain, And use for amp stands, they look great, as wood is always in style!
as is a 3-4 inch slab of granite, or marble, or anything heavy which don’t let vibrations in.
Enjoy.