The only thing better than a sweet freebie, is one that spreads the love to others. You can earn your kids (or yourself) free Wendy’s Frostys for a year just by lending a helping hand. But you’ll need to act fast.

For just a $2 charitable donation you can pick up a 2018 Frosty key tag during Wendy’s annual sale. That key tag entitles you to a free Jr. Frosty with any purchase throughout the entire year. A Jr. Frosty normally comes with a a Kid’s Meal which runs for over $3, which means your entire years worth of Frosty’s is paid for after just one visit.

On top of scoring an awesome deal, you can also feel great about the fact that your donation goes to the Dave Thomas Foundation for Adoption. The tags are on sale now through  January 31, 2018. After that you’ll have to wait a whole year for your next chance at free Wendy’s Frostys

What’s your family’s go-to fast food? Share your favorite spots in the comments below.