kexcelled Flame Retardant PC Filament,Black Polycarbonate Filament,PC FR with UL94 V0 Grade Halogen-Free Fire Retardant &Heat Resistant，1kg Spool (2.2lbs)

Amazon-only with a wide SKU list: PLA through TPU, including silk and specialty variants. Prices sit at the low end; quality is consistent enough for general use.