SUNLU Silk PLA Filament 4KG, Smooth Silky Surface, Silk 3D Filament, Dimensional Accuracy +/-, 1kg Spool(2.2lbs), Total 4KG, Silver

Well-known as much for their S1/S2 filament dryers as for the filament itself. The material catalog — PLA, PETG, ABS, TPU, silk — is broad and frequently discounted on Amazon. Solid all-around option.