A small neighborhood market near me used to have marinated filet mignon on sale for $5.99/lb. (vs. $7.99/lb. non-marinated), so when they had some, I'd pick up a few. It was good, but apparently not that popular because they stopped having that sale.
Also, our local grocery store had full racks of baby back ribs, pre-marinated, advertised for $5 each. Intrigued, I went to check them out. I'd never seen such small racks of ribs. They must have come out of suckling pigs or something. Maybe 10" long and about 2.5-3" wide and weighing about a pound (marinade included).