Most likely what you are looking for is called open cell foam. It isn’t cheap. It is the kind of foam that is used for sound reinforcement. Try E-bay and Craigslist. Search open cell foam, egg crate foam and soundproofing foam. Every once in a while you will find some. All depends on how thick you want it too. The thicker it is the more $$$$$ you will be spending
To give you an idea of how much you can spend, if you get it retail, to spot treat my 10 x 10 studio it cost around $400, and that’s with a bulk pack. I have found it usually goes for around $3 a square foot when you buy it in large quantities.
You may want to try the craft stores too.
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if your brain had fists, you could only hurt yourself!
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