Wedding dress help! 💍👰🏻💋👗

Okay guys! My fiancé and I got engaged when I was 6 months pregnant. We decided that we would wait until after our son got here to decide on the date and details. We have been back and forth if we just want to go to the courthouse, or if we honestly wasn't too spend ALL THAT MONEY on a wedding. We just decided about an hour ago to just go to the courthouse in a week and get married! I'm so excited! Except for the fact that I don't know what to wear! 😱 I want just a simple white dress. Does anyone have any ideas on where to get one? Help!