OK, as I stated, I am sure Joann's fabrics has canvas. You could try calling there to see if they know of local seamstress to make the cover, or start a post looking for a seamstress to do this. Since you are doing a retrofit, keep your options open for attaching the new cover. For example, using Velcro in several locations instead of trying to have it fit over the supports real tight may make it much easier to get replacement.
There are shops in the area that make custom automobile convertible tops. This is the same material, they maybe able to make a simple cover.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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