Double wall ovens...

I did a search on google .. all I could find was a Frigidaire...

Here's a link...

Frigidaire

Maybe try contacting a large kitchen design place .. they should be able to hook you up with places that would be able find something like this .. also .. I know from an experience with Home Depot .. that they have a lot more available through their books than what's displayed on the floor .. if you haven't already asked them.