If you ever go to Epernay, the Nicolas Feuillatte Champagne cellar tour is very good, we also enjoyed the Mercier tour. Anyway, in the town centre there used to be a super champagne shop, selling the local vineyard bottles with many variations of the three grape varieties. They used to do a 6 glass tasting and guide through the store where you can pick your bottles according to taste. Prices for these ranged from €17 upwards (rather than €30+ for brand names) and we never left disappointed.