You guys inspired me last night with this post. I had some vinyl fabric left over from recovering my motorcycle seat, so I went for it. It was kind of a hack job on the tracing but after sewing it and turning right side out it looked and worked great. My wife was laughing at me because I was sewing.

 

I'll have to dig through my old computer to see if I can find those photos again. Very nice work with the vinyl.

 

Go online. There are dozens available for $10 to $20 in most durable materials around. I replaced mine years ago in leather but I had to preserve and then refit the wire supports in the new ones.