Great find. Congratulations
I looked for 2 years and couldn't find any.
Bought some 5' red used from a lumber yard. Used it - Loved it and this year bought some 8' green.
Will last forever
I'm still looking for more.
Those work nice too.
Another source might be if you see one of those carports going up, many times they have lots of scrap. I got lots when they put up one for us. I just told them to leave the stuff and I'd clean it up in the morning. After all, it was 10:30 at night and dark. In the morning I found they left lots of good stuff. One sheet of steel 14' long and 30" wide. Sweet!