Inside Round Roast, 2.5-4 lbs, actual cost based on weight of package.
Beef round is a large primal cut consisting of well-exercised muscles from the leg and rump of the animal. But the top round (also called inside round, because it comes from the inside of the leg), is actually a good cut of meat for roasting, as long as it's done slowly at a low temperature. Cooking it this way ensures that it comes out medium rare, thus preserving what little tenderness the top round has to begin with.
It's also important to slice it thinly. Roasted top round is ideal for making roast beef for sandwiches.