Location: A Southern Gentleman (Southern California)
I would imagine a market in St. Martin would have the best pricing for French Bubbly, hense, French Provence.
All other Countries selling French Bubbly would have a import tax imposed.
You may not be able to take the bubbly back to your stateroom, the cruise lines are cracking down on the booze purchased at the Ports.
If your flying, remember the weight restrictions.