Where can i buy 'stuffing' for my couch? I like my couch, its contained by good condition. Problem is years...

I like my couch, its contained by good condition. Problem is years of sleeping on it have made it very squishy and soft. The cushions hold zippers and inside is your standard 'yellow' foam surrounded by some coarser white material.
Id close to to replace the 'guts'. I just don't know where on earth to get the stuff and how much it would cost to buy it.
Any info would be great.
How do I re-finish a patterned piece made...
Answers:    Nearly adjectives modern couches have a foam core to be precise wrapped in some sort of poly imbue. You can buy the fill at material stores.

What you'll probably want to do is add an inch or two of foam to the existing foam, and after put on new poly crowd. Or have a foam or upholstery shop do this for you.
Crown Molding...?
You can enjoy an upholstery shop replace the foam and poly wrap or go to an upholstery supply contained by your area and buy the materials.