Best places to buy synthetic foam for bedding

hi, I remember reading that some people had skepticism or bad experiences about some of the online form suppliers, I think it was foambymail? Can I get a clarification as to which foam sellers are trustworthy, and closest to point of manufacture/lowest price, if looking to buy quality, certipur foams for bedding or upholstery? Anyone that offers products with certifications better than certipur (Greenguard gold, other European certs, etc.) would be even better. Thanks!

ordered from ‘the foam factory’ had no issues, but not sure what i should have or have not been looking for

seems on par pricing wise, foam has been nice