Taco Tuesday here is the best lunch spot. $2 per taco and $3 for the special makes for a great deal, as 2-3 tacos are filling! Less than $10 for a lunch is hard to find so this is a great little treat.
Make sure you have a little extra time because even though the food comes out relatively quick, the waitresses are slow to return or bring boxes so I usually let them know in advance when I am done with my order.
However, the other items tend to run $10-17 each and are equally small (see: standard) portions so it is an expensive place if you aren't purchasing a special.