Mont. Code Ann. § 30-11-602

A factor shall obey the instructions of the factor's principal to the same extent as any other employee, notwithstanding any advances the factor may have made to the principal upon the property consigned to the factor, except that if the principal forbids the factor to sell at the market price, the factor may, nevertheless, sell for the factor's reimbursement, after giving to the principal reasonable notice of the factor's intention to do so and of the time and place of sale, and proceeding in all respects as a pledgee.