Well-developed and changing. More recycled-content types are being developed. Cotton insulation is new. Air Krete requires trained installers. Perlite and rockwool are available.
Prices can vary according to installer.
The general public is mostly unaware that CFC's can exist in insulation. Cellulose insulation is commonly accepted. Cotton insulation is attractive to environmentally-aware individuals and those doing their own insulating work as it will not cause skin irritation. Perlite insulation is relatively unknown to the general public. Cotton and perlite are not likely to be negatively perceived.