West Virginia Code Chapter 47. Regulation of Trade § 47-11A-6. How cost determined

(a) The term “cost” when applicable to the business of retailer shall mean bona fide cost and shall mean: (i) The invoice cost of each separate or distinct product or item of merchandise to the retailer to include applicable taxes, or the replacement cost thereof to the retailer within 30 days prior to the date of sale, offer for sale, or advertisement for sale, as the case may be, in the quantity last purchased, whichever is lower, from either of which there shall be deducted all trade discounts, except customary discounts for cash; and (ii) to either of which there shall be added freight charges not otherwise included in the cost of the article, product, or item of merchandise, but which freight charges shall not be construed as including cartage to retail outlet if done or paid for by the retailer.

(b) The term “cost” when applicable to the business of a wholesaler shall mean bona fide cost and shall mean: (i) The invoice cost of the merchandise to the wholesaler to include applicable taxes, or the replacement cost of the merchandise to the wholesaler within 30 days prior to the date of sale, offer for sale, or advertisement for sale, as the case may be, in the quantity last purchased, whichever is lower, from either of which there shall be deducted all trade discounts except customary discounts for cash; and (ii) to either of which there shall be added the following items of expense: