if your really want a suit that's unique try link , don't let the name fool you, they don't only carry string bikini's , they also have some full bathing suits which are also very sexy. they are a bit pricey to my liking, but money well spend.
Order online. A store sell something that is popular in Australia that hasn't hit the U.S. yet so you will probably avoid the duplicate thing as everyone else. Or buy something and put your own modification to it. Customizing will make things more unique and special.