The Big Smasher starts at around $12.99 on its own, but the price differs slightly by location. At my local Chili's, the burger cost $14.39, excluding tax.
This meant that ordering the burger as part of the 3 For Me was a no-brainer because the deal starts at $10.99, excluding tax.
With the deal, you get an appetizer like bottomless chips and salsa, a drink, and an entrée. I decided to add a margarita instead of a bottomless soft drink to my order, which added an additional $3.99.