In determining the lowest price for which any item of spirituous liquors was sold in any other state or in the District of Columbia, or to any state or state agency which owns and operates retail liquor stores, appropriate reductions shall be made to reflect all discounts in excess of those to be in effect under the schedule, and all rebates, free goods, allowances and other inducements of any kind whatsoever offered or given to any such wholesaler, state or state agency or retailer, as the case may be, purchasing the item in the other state or in the District of Columbia. Nothing contained in Sections 60-8A-12 through 60-8A-19 N.M. Stat. Ann. shall prevent differentials in price which make only due allowance for differences in state taxes and fees and in the actual cost of delivery. As used in this section, “state taxes and fees” means the excise taxes imposed or the fees required by any state or the District of Columbia upon, or based upon, the liter of spirituous liquors.