The Jan Linders chain of shops have sold the Trappist beer for the equivalent of £9 a bottle, almost five times more than the monks charge.
The Brothers of the Abbey of Saint Sixtus in Westvleteren in Flanders normally sell Trappist in a glass at a bar opposite their abbey and, for the fortunate, a special phone line can get a customer two crates of 24 bottles for up to £39 which they need to pick up at the abbey and provide their postcode for in advance.
According to The Daily Telegraph, the abbey's spokesperson said: "A price of almost ten euro per bottle is contrary to the ethical standards and values the monks stand for".
They added that the monks do not make it for profit but just to make a living and any profit is given to charity.
A spokesperson from the supermarket chain said they had made minimal profits and had bought it as a reward for loyal customers.
It appears to have been bought through middle men, somewhat undermining the exclusivity of the beer.
The abbey responded: "We especially hope that it will not happen again."
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