Where to find gamay rouge besides v. Sattui?

That's mostly of historical interest. Most of the "semi-generic" wine types such as Burgundy, Chablis, and Claret, while still permitted by FTC regulations, have largely faded from the market even at the low end. Champagne, Marsala, Sherry, and Port are still commonly abused. The vast majority of contemporary California wines have varietal designations. The law used to allow "Napa Gamay" and "Gamay Beaujolais" but as of 2007 those are banned.