Several small récoltant-manipulant (grower-producer) champagne houses in Hautvillers offer tastings directly from the producer. These are not the grandes maisons of Epernay — they are family operations making champagne from their own vineyards, typically without appointment, in cellars you can walk down into. The champagnes tend to be more site-specific and expressive than branded products.
The houses change over time and not all are consistently open, so it is worth calling ahead or simply walking the main street and knocking on doors with tasting signs. Prices are reasonable, the atmosphere is informal, and buying direct from the producer here is a different experience from visiting the grand cellars in Reims or Epernay.