1 Bridesmaid dresses cost, on the low end, about $50 to $100 for an off-the-rack dress from an online shop or department store.2  In the mid-range, they cost $100 to $250 for a standard, satin bridesmaid dress without elaborate detail. In the mid-range, they cost $100 to $250 for a standard, satin bridesmaid dress without elaborate detail.