Best site for plus size BM dresses?

All of my BM's are plus size... 14, 18 and 34. The girl that is size 34 promises to be at least a 26 before my wedding in 15 months. She's already lost 25lbs since I got engaged on Christmas. I always prepare myself for the worst so I'm in search of a company that sells dresses into to size 30's. I really hope she'll pull through for me but like I said, I hardly ever put faith in other people and I can hope for the best but I always need to be ready for the worst. I know some David's Bridal BM gowns go to size 30 but that's really for someone who wears a clothes size 24. (I'm a clothes size 18/20 and my wedding gown is a 26). I'm looking for a company who sells true to size dresses into the 30's.

Best site for plus size BM dresses?

http://www.sydneyscloset.com/glamour/bridesmaid-dresses
Check those out. There's a store in Port Jefferson that carries them.
A friend of mine who was in the same situation used this company.