I ended up ordering mine from Bucther Block Acoustics in maple this weekend. I am getting the end-grain version in a custom size (19.5 x 16.25 x 3) to fit my SolidSteel WS-5 wall shelf as direct replacement for the MDF board it comes with. They say it should be about 6 weeks for production. They were going to quote one in cherry to match my furniture, but I’m changing the latter next year anyway, when I get a Naim Fraim, which I will do with either black or ash shelves.