There be dragons. Hatchbox brand filament is always a good bet Depending on what you want to do, you may also want to check out some of the different infused PLAs. For example, wood-fill PLA tends ...

that uses empty filament spools, some 3D prints, and not much else. These are all Hatchbox spools, and it won’t work for every type, but the design should scale up and down to fit other flavors.