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It all depends on your budget & how mobile you are.
Taxis to visit champagne houses outside Reims or Epernay are around 50€ each way - making it unviable for most.
The large Champagne houses have fantastic tours so we generally recommend to visit them. The cost of cellar visits have increased a lot recently, so expect to pay from 60€ & up for each visit with 2 samples.
For us, we do do visits, but they are more on the technical side - cellar & vineyard work - so they do not appeal to all.
If budget allows, I would recommend staying here:
https://royalchampagne.com/
I feel like this is a good place to ask, I'm actually spending a few days in Champagne in December. Can we visit? Any other good places to drop into?