If the label only reads "ground hamburger" or "ground beef" without specifying anything ... then go for ground sirloin ...

DEAR DR. BLONZ: Compared with 75% lean, would 95% lean ground beef be considered low-fat? This came up during a discussion at a burger party, and we all recorded our votes. Is one that much more ...

Since not many people buy beef shank, it's not typically found in stores as anything other than low-fat ground beef. It is fairly cheap in butcher shops though, and an ideal cut for beef bourguignon.