I just went today (Monday) and learned that every Monday after 4pm the items on the menu are all 50% off. I went with two other friends and our total bill was under $20! The normal prices on the menu were reasonable too. I also liked how they bolstered Michigan-made products like Sanders on their dessert menu and Michigan clove honey in their root beer.
The WAB is at Woodward and 9 Mile in Ferndale. I definitely recommend it.