For just $2, you can get unlimited Frostys at Wendy’s for an entire year, as Money reports. If you purchase a promotional key tag for a couple bucks any time in the next year, you can flash it at the checkout of any Wendy’s nationwide to get a free junior-sized frozen treat with your purchase.

If you are a Wendy’s aficionado, you may have already participated in previous versions of this program, which only cost $1. But at least the price increase is going to a good cause: Ninety percent of the money will go to the adoption-focused nonprofit Dave Thomas Foundation, named for the Wendy’s founder (who was adopted as a child).

The key tags are sold out online, but are still available in Wendy’s stores, so hustle to your nearest location for an endless supply of those sweet, sweet chocolate ice drinks.

[h/t Money]