One supplier of course is Tandy. Their different sizes and all be sharpened much better than the come from the factory. Just use some wet/dry 1200 grit sand paper on a hard surface until it is polished. Then use rouge on a piece of leather to make the final polish. it must be polished to be sharp!
Another supplier is Barry King Tools of Sheridan, WY. He makes stainless steel edgers that come sharp. But to keep them sharp, use the method above. Does this answer your question?