You should think about going to the
Brides Against Breast Cancer event! (<-clicky) I know someone has posted about this previously, but I thought it was worth repeating
I just got back and found my dress for $100 and it won't need alterations! There were a lot of good deals and I saw dresses at different price points ($100-over $1000). I think it goes today and tomorrow. Well worth checking out, in my opinion.