The easiest place to find one would be the local small engine or lawnmower shop. Finding a good used one is almost a miracle. Google or yahoo search for Tecumseh HS50 carb, Tecumseh HS50 carburetor, HS50 carb, or HS50 carburetor. They're around $70 most places, and you'll need all of the #s from your engine to get the right one.