Tractor supply sells a dense rubber mat that's about 3/8" thick. Not sure what it's for, they have it on a roll outside. It's black, comes in a 48" width and they sell it by the foot, think it's about $5 per ft (could be off on the price, dont remember exactly)
It's fairly hard, but still mashable...if that makes any sense. I have it under a couple of tanks.
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