Reddit mentions of Plastic Cutting Board 18x30 1/2" Thick White, NSF Approved Commercial Use

With that particular case, fan should face down due to the shroud, however if the case will be on carpet I recommend buying a hard flat surface like this to place it on. Just make sure the case is stable.

I use something close to this. https://www.amazon.com/Stanton-Trading-2-Inch-Cutting-Board/dp/B0032AM0LW/ref=sr_1_3?ie=UTF8&qid=1526487230&sr=8-3&keywords=huge+cutting+board

I have a stack of shitty plastic cutting boards that are around 13x18" and thin/flexible. I don't really like using them for cutting (though my roommates certainly do) but they work well for moving things around or for mincing herbs. Edit: I should also add that some of them have a honey-comb texture on the bottom which does nothing to keep them from slipping around but does trap water so they never dry properly in the dishwasher.

I have an epicurean board that I like quite a bit for most tasks. It goes in the dishwasher and I think I've given it a slight bend but it's double sided and the rubber feet work well.

I also have a big polycarbonate board that I use for briskets and such. It's pretty awesome.

I like using plastic. I got the biggest one I could find.

https://www.amazon.com/gp/product/B0032AM0LW/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1

I bought one of those big white plastic cutting boards from a local restaurant supply store, then cut it down on a table saw to exactly fit the counter top that I do my prep work on. It's still small enough to get into the sink (well, edgewise anyway) for cleaning, and it wasn't very expensive at all.

EDIT like one of these: (http://www.amazon.com/Stanton-Trading-2-Inch-Cutting-Board/dp/B0032AM0LW/ref=sr_1_21?s=kitchen&ie=UTF8&qid=1457878118&sr=1-21&keywords=plastic+cutting+board)