Track coach needs drywall or plywood circles (Memphis)

I am a track coach looking for a 7ft and 8ft in diameter piece of drywall or plywood for my shot put and discus throwers.
I will paint around these pieces so it doesn't need to be pretty, but needs to be 7.
&.
8 feet in diameter.
Needed as soon as possible.
Drop me an email with your prices.