Sourcing foam rubber for cushion

We picked up 2 old chrome barstools, the kind you'd see in an ice cream parlor. The chrome is in awesome shape! The seats, not so much. The coverings are torn and the foam is pretty much disintegrating.
What is your best source for getting some good, thick foam to use on these without breaking the bank? Especially considering the stools were free! (Score!)
sourcing foam rubber for cushion, painted furniture, The white caps on the feet are not original I ll replace w casters
The white caps on the feet are not original. I'll replace w/ casters.
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