I am continually surprised at how many locals are not aware of the amazing deals available right in their own backyard. During the early year restaurant week I mentioned it to my co-workers and not one of them had ever heard of it!
Here's the deal:
In Charleston, they have a restaurant week twice a year. The next one starts Sept 7th and runs for a week. During this week, the restaurants offer 3 course meals for between $20 and $40. You know the menu and pricing before you go there (mostly - some restaurants vary their menu based on available ingredients.) Some of these restaurants would cost you $100 for a night out, minimum.
Here's the link to Charleston:
You should google your city with the words "restaurant week" to see if your's does it. I tried a few for you:
Try it, it's fun!