I would agree with the majority,
I too went to a marble and granite counter top manufacturing co, I got one 18" x 28"
and a matching one (same pattern) maybe 12" x 36" for free.
They make you jump through all kinds of hoops though. I need to call the boss for permission, what will it be used for, can you come back tomorrow, ?etc. ? Thats, that much less they have to dispose of. But free is free, and I like mine !
Don't take NO for an answer, Barter if you need to, you can charge a fee to haul it off for them, or you can do it for free.