Budget can be such a deciding factor when it comes to dress shopping. I think that the smaller your budget is, the more limited are your options. However, I do not believe that you cannot anymore get your dream dress with such a budget. There are still ways by which you could get "the one".
If you are opting for a designer dress which could probably cost a million bucks, you could always have a similar dress made. I do not suggest copying the entire thing though because this could give rise to copyright violations. But if it is a particular silhouette that you like, then I think it is okay to have the same copied.
Another option you could avail of is to buy cheap wedding dresses online. Yes, that Robe de Mariée Pas Cher you are dreaming of could be found online! Most online shops have tons of designs to choose from without that designer dress price tag. You could have a dress custom made so that it will fit you like a glove. Otherwise, they have tons of size and color options readily available.
One wrong connotation when it comes to cheap wedding dresses is that their qualities and style are compromised. While there are shops that fail to deliver as regards quality and make, there are still several shops, particularly online shops such as http://www.airmode.fr/, that makes quality cheap wedding dresses.