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You could get ground sirloin by cubing a sirloin steak and running it though a grinder or your food processor. You are paying for convenience even though they are mostly grinding the trimmings from that section.
Hamburger is made from the trimmings from many different portions of the animal and mixed with fat to get the desired proportion. (80%, 90%, 95% lean)
'La bonne cuisine est la base du véritable bonheur.' - Auguste Escoffier
(Good food is the foundation of genuine happiness.)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)