For standard sizes, quick shipping, or small DIY quantities, general marketplaces offer the most variety.

: A reliable source for specialized kits, such as 2-part liquid pour foams for boat flotation or large-scale spray insulation kits.

If you need to feel the firmness of the foam before buying, consider these local options: Polyurethane Foam - FoamOnline

Specialty shops are the best option if you need custom-cut sizes or specific foam densities (like high-resiliency or memory foam).

Polyurethane foam is highly versatile and available in various forms—including flexible sheets for upholstery, rigid boards for construction, and liquid sprays for insulation. Where you buy it depends largely on your specific project needs.

Polyurethane foam, also known as Polyfoam, is an inexpensive foam most often used for packaging, shipping, and storage. FoamOnline Лемана Про

: Excellent for custom-cut upholstery cushions, mattresses, and craft-specific foams like EVA or thick PU blocks.