London Broil is a great bit of beef that you serve sliced thin, like flank steak. It is very common to find it on sale for $3.77 a pound in my area. This is an outstanding price for beef, let alone an awesome tasting cut like this!
Cooking this via "sous vide" is the way to go, you can hold the meat perfectly ready from 30 min to all day long, then finish with a quick 2 minute sear. I show this, along with my favorite garlic lemon butter sauce for this type meat.