Didnt see this mentioned yet so I figured free frozen beverages are always a a welcome topic. Anyways, Today 7/11 (Get it? Ha!) you can get a free 7.11 oz Slurpee at 7-11 Stores. No purchase necessary.
Keep in mind 7.11 oz is reeeally small. I just got back from 7/11 and decided to buy a full sized one instead. I wouldn't recommend it unless you're gonna hit up a bunch of 7/11's for a bunch of Slurpee. But I did find an aluminum slurpee straw for $1.
Yeah they are small, but at least at my 7/11 they didnt seem to limit how many you could fill up. As one SeanTM22 clearly showed. (Bravo to you sir. I like the way you work the system haha)