The prices at In-N-Out are slightly lower than competitors such as McDonald's and Burger King. However, In-N-Out has a far more limited menu and no varying size options.
At In-N-Out, the most expensive burger is the Double-Double with onion, which sells for $3.40, as of 2015. The least expensive burger is the Hamburger with onion, which sells for $2.05. At McDonald's the most expensive burger is the Double Quarter Pounder with cheese, which sells for $4.79. The least expensive burger is the Cheeseburger, which sells for $1.00.
Somewhere like McDonald's has a larger menu, but much more variation in pricing. On average, In-N-Out is noticeably cheaper, albeit with a more limited menu. Nothing on the In-N-Out menu exceeds $4.00.