Activity for Cha

Anybody have any leads on reliable online retailers with bridesmaids dresses for less than $100? Thinking going the convertible dress route (for around $70), but wanted to know if there are other options. Thank you!

All of my (very extensive) research so far has been comparing hotels that meet our capacity and have packages that include everything from set-up, staff, tables/iinens/place settings, hors doeurves/entrees/alcohol, a night in the bridal suite, etc....