Mother-of-the-bride dresses also work well as mother-of-the-groom dresses. Mother-of-the-groom dresses cost, on the lower end, from less than $100-$200 for a dress from a discount department store or online retailer.For example, Amazon.com start at price $40, and Promboutiqueonline.com start at price $70 with free custom made service. Shop: 3PCS Chiffon Mother of The Bride Pant suits They...