I got mine from
AutoTopsDirect | Convertible Tops | Convertible Top Headliners | Convertible Top Parts. $639 right now for the A5 top with heated glass.
Based on my previous research, I think it is the exact same as the GAHH top, but isn't warrantied for quite as long. In the eBay link you posted, the bond between the glass and the canvas seems different. The eBay one has a black band around the glass, while the GAHH/autotopsdirect one does not have that.