I just bought 3.5lbs of it. I love how they don't look at me crazy when I ask them to package it as 2- 1lb packs and 1 -1.5lbs pack. I do this so I don't have to measure. I make a meatloaf with the 1.5lbs pack, spaghetti with a 1lbs pack, and some sort of snack- usually a chile con queso dip with the remaining 1lbs pack.
Sales are an awesome way to increase your savings and sometimes, a great way to take the guess work out of what to meal prep.