Check out In-n-Out's secret menu
http://www.badmouth.net/in-n-outs-secret-menu/
Here is what I always order
2x1 (2 patties 1 cheese)
extra grilled onions (free)
add jalapeno peppers (free)
extra toasted (free)
Animal style (they fry it with extra sauce and pickles. DELICIOUS)
The whole thing is more than enough for a grown man to feel full. Without fries. And it costs under $3.
To people who DONT like the fries, remember that in-n-out is like, the *ONLY* fast food place that gets their fries as potatos, cut them there, and fry them there.
You can order them well done or "light" (less done) too. AND you can order the fries animal style, which is really really delicious, but costs a bit extra.