Luckily for me I found a Nicole Miller dress on ebay that was $150. SCORE!
Luckily for modern beach brides, these days there are easier options. I found browsing the internets:
Carly Dress
Jordy Dress
Jordy Dress
Riri Dress
Sienna Dress
Fighting Eel's bridal collection. Gorgeous beach bride attire and gorgeous dresses for your bridesmaids as well, all under $200. Best of all, they are made in Hawaii!