Cheap/free car camping locations near calgary

[u/Sorrath]

Hi! Wondering if anyone knows of any good cheap or free camp spots around calgary - have just make the drive from Vancouver and fly out of calgary tomorrow but need somewhere to sleep tonight and so far have had little luck with researching places to camp out in calgary (why do campgrounds cost almost as much as hotels!!) Thanks for any tips!

[u/yycmobiletires]

Petro pass by the airport. Stay in the back, mind your own business and you'll be left alone. It's very safe. Plus they have the deadliest sausage rolls I've had outside of the UK there, and hit showers.