You can find junior bridesmaid cheap wedding dresses at the same places you find bridesmaid cheap wedding dresses and formal wear. A junior bridesmaid is a member of the wedding party who is younger than the rest of the bridesmaids, but older than the flower girl. Normally a junior bridesmaid is an attendant whose age falls between 6 and 12. A junior bridesmaid dress is like the older bridesmaids, but the style is age suitable. Buy the junior bridesmaid dress at the same time as the bridesmaid dresses so the fabric comes from a very similar dye lot. Select a classic style. Selecting a knee or ankle length dress and a less formal style guarantees the junior bridesmaid can wear the dress for another "dressy" occasion. Usually you will be able to purchase a junior bridesmaid dress at the same place you'd purchase a wedding or bridesmaid dress. Bridal or formalwear shops are your best bets. Stores selling "dressy" dresses may also have styles suitable for weddings.