There is a Waffle House I went to once that was the cheapest place ever. Cash only--though of course they had a $3 charge ATM on site. Huge warnings that they would not let you get the specials to go--they are for dine-in only. Finally, if you sat in a seat, even if only to accompany someone, you had to buy something, and not just coffee. Just coffee was not good enough; you were required to either pay for two cups or buy some food.