actually, its Wynn's Source, passed along by sandy, to me...
http://www.tapplastics.comthey can make anything customized (shape, size)
it cost me $0.20 for each acrylic block (5x5 size)
I contacted them yesterday about solid blocks for the Mental Block. Sandy has the same ideas i do: glue on, and then cut down. They wont give me a price over the phone or email though, and i dont really want to hook up my dad's fax machine. They will ship anywhere in the US, i dont know about international, But they do use UPS so i cant see why they wouldnt