A few years back I bought a sofa from a small manufacturer that claimed it was free of fire retardants. Similar story for my mattress. The mattress side took some research, but from what I found most foam mattresses are free of them, and some manufacturers use a tightly woven cotton cover to get the fire retardant properties, rather than a cover treated with fire retardant chemicals.

Do your own research, but from what I found it’s not too hard to be careful about this stuff.