Cinelli offered the Giro d'Italia (64), Criterium (65), and Campione del Mondo (66) all with double grooves and these can be found on ebay pretty easily in both the 26.4 and 26.0 clamp diameters. There were also the Cinelli Top Ergo bars, which had a classic bend and were doubled grooved, but were extruded differently so as to be lighter. They also feature a blue-grey anodizing. Bikyle still has some in limited styles.

I have seen the 3TTT "Competizione Ergo Due" (or something like that (?) otherwise known as Merckx-bend) in silver and double-grooved. They are out there, just gotta search.