If you need a swimsuit super fast for like a holiday or something Swimco can be helpful. They have many suits in many styles and may popular brand names. Unfortunately, I cannot give this place top points because a) All the stores are standardized b) service is somewhat impersonal. Every time I go I get asked the same questions and told the same things, "Are you going away somewhere?" and "make sure the bottoms fit snug because they stretch out in the water". After awhile this gets really annoying.
Yes, they are pricy considering everyone will end up with the same suit as you. I really like Seafolly, for example, but everyone has them! Why would I spend $200 on a suit that makes me look the same as everyone else on the beach? I think not.