I bought two 12x100x200cm pieces of (probably) PU foam from a local hardware store in the Netherlands. Link (Dutch): https://www.hornbach.nl/shop/Schuimmatras-2

I bought two 12x100x200cm pieces of (probably) PU foam from a local hardware store in the Netherlands. Link (Dutch): https://www.hornbach.nl/shop/Schuimmatras-200x100x12-cm/3843210/artikel.html#artikeldetails https://www.hornbach.nl/shop/Schuimmatras-200x100x12-cm/3843... 25kg/m3 density, 4kPa compressive strength, 70 euros per piece. I didn't notice any smell with any of the foam I bought. The only issue I ran into was one piece of foam not expanding properly - it only expanded to about 8cm thickness, not 12 as advertised.