In the easter holiday i ordered a big block of EVA foam, so that i could carve into it and make the sole of a shoe, the block cost around £40 and it was ordered from ebay. when it arrived i realised that it wasnt dense enough and was more like the cussioning you find in a sofa. I didnt want to use this because i have found a different type of foam called closed cell EVA which is basically the same thing however all the small air pockets are mostly filled up and is more dense.
My brother uses it to make the insoles of shoes for people who have sporting injuries, etc. He is going to get hold of a few sheets for me so that i can carve the sole.