I don’t know if this deal is available nationwide, but at my Wendy’s, here’s how you can get a free Frostie float.
If you’re already going to Wendy’s (I love their 99-cent menu!), save your receipt. On the back of it, there should be some text prompting you to take a quick survey by phone or online.
I did the online survey, and it took like 3 minutes.
At the end, they’ll e-mail you a code number.
Write the code number on the back of your receipt (you’ll see a line for it) and you can take it to Wendy’s and redeem it for a Frostie float ($1.99 value).
You can get your receipt, call the survey number from the parking lot, and go back in and redeem it in the same trip (I think) if you wanted.