I'm a land surveyor, and make my living, with a machete either in my hand, or close by. A few years ago, I bought a few from a military surplus store, made by Ontario Knife. They have a 22" heavy blade, with U.S. stamped at the base of the blade, are easily, and quickly sharpened with an Accusharp tool, and last a loooong time. We typically only break them in the dead of winter, after they've been used for a year or so. They get brittle and probably see more stress than intended, since we use them daily. Cost about $25.