Wendy's does sell and serve chili cheese fries and have since at least 2012 and they are pretty good chili cheese fries.
The chili cheese fries at Wendy's is made using their Natural-Cut Fries topped with their trademark chili, cheddar cheese sauce, and a sprinkle of shredded cheddar cheese.
The price of Wendy's Chili Cheese Fries is around $2.49 before taxes.
They do make some good chili cheese fries for the price and I also love their other foods as well.
DQ also sells good chili cheese fries as well so you can check out DQ as well.