(18) "Retailer," for purposes of this chapter, except as provided in the definition of "wholesaler," includes every person engaged as owner or agent in the business of selling or exchanging goods for cash or barter or any consideration on the assumption that the purchaser of such goods has acquired the same for ultimate consumption or use and not resale and, where engaged in the foregoing business, includes automatic merchandising machine operators regardless of the product dispensed or vended, retail plant nurseries and florists, hucksters, peddlers, trading stamp redemption stores and catalog stores (except such stores described in paragraph (21)a.6. of this section) and branch stores.
"Retailer," for purposes of this chapter, shall not include, however, an individual under the age of 18 who engages in: (a) The delivery or distribution of newspapers or shopping news (not including delivery or distribution to any point for subsequent delivery or distribution); or (b) the sale of newspapers or magazines to ultimate consumers, under an arrangement under which the newspapers or magazines are sold by the individual at a fixed price, the individuals' compensation being based on the retention of the excess of such price over the amount at which the newspapers or magazines are charged to the individual, whether or not the individual is guaranteed a minimum amount of compensation for such service, or is entitled to be credited with the unsold newspapers or magazines turned back.