Styrofoam for cutting marble (Richmond)

Does anyone have a styrofoam block that could be used to help with support while cutting a piece of marble (maybe 3x3’ or 4x4’)? Or better yet, would anyone be interested in helping me cut a piece of marble? I can rent the tools if I need to, and I can buy the styrofoam if nobody has it - I just don’t know what I’m doing.
* I got a free piece of marble and wanted to protect a cabinet top in my kitchen with it. It needs 2, maybe 3 straight cuts to fit.
(Sorry if this is a ridiculous post. I just got excited about the free marble.)
Can you help with this request?
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