I would think any decent upholstery shop could set you up....see if you can't find one near you, give 'em a call, and take the EB over to see what they say.
I've got a shop that's currently fixing/restoring my STC softtop and when they finish that I'm going to have them quote making me a tonneau cover for the rear. I doubt one could be mass-produced simply because no 2 EB's are built the same (unless they're bone stock, which would be a very small segment of the market), so custom is likely your only option.