If you ever get to Keuka Lake, specifically Hammondsport, NY, get yourselves as many bottles as you can afford of Great Western Champaigne, from
Pleasant Valley Winery. $10.45 a standard bottle, $21.39 for a 1.5L.
Ye Gods, is it good. Not quite on the scale of Perrier or Dom Perignon, but suspiciously close. Beats the all frak out of Korbel.
I got it at a local shop. I regret not buying this while I was at Keuka.