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Which "Way"? The Norte? There's a Decathlon in Santander. They definitely sell gas but under the PRIMUS brand. You're looking for Cartuchos de Gas by the way - it won't necessarily be MSR branded, Coleman and Camping Gaz are more likely.
Gas canisters are available, but the main concern is not the brand but the type of connection your stove uses. It is more difficult to obtain gas canisters with the screw in connection common to the US. So double check which connector your stove uses.