I'm in Ottawa, On.
I went to the only place in town that will give you a piece the size you request, Plastics of Ottawa. I just got straight cuts, but they offer basically anything, including bending, for a price of course.
At first I was gonna do 1/2" lexan, but that was over 100$. I opted for 3/8" plexi which I scored for 40$. That's 36" x 15" x 3/8" plexiglass
I actually had a girl ask me if it was strong enough to stand on, so I started jumping up and down right in the middle of it.
me:"That's 3/8" plexi, girl, of course it'll hold"
her:"Are you sure?"
me:"Screw it*starts jumping on coffee table/subwoofer*"
In retrospect, it might still be overkill.