The deal is good at participating locations on Sunday, January 1, 2017 with no limited on how many orders you can buy. The 99-cent price is only valid on a regular order of Chili Cheese Fries.
Wienerschnitzel's Chili Cheese Fries consist of French fries topped with the chain's signature chili and shredded cheddar cheese. They typically sell for around $2 or so. You can find my previous review of them here.
Photo via Wienerschnitzel.