Where do ya'll find your prom dresses?

Looking for a prom dress and wondering where the best places are for a NOT over-the-top dress? Daughter prefers slightly more casual style. Not interested in ball gown style or loads of sequins. Willing to drive anywhere. Have tried One Enchanted Evening for homecoming but went on a Saturday when they were mobbed and daughter didn't love how you had to walk out to the mirrors to show your mom the dress, in front of literally 100 people who were all waiting for their daughter to come out and model each dress. It was a bit anxiety-inducing for someone who is introverted. Waited 30 minutes for a dressing room to try on 5 dresses, none of them worked, didn't want to get dressed to go look for more dresses and wait another 30 minutes for a room again, so we left. Not sure if a weekday would be better. Hoping for something "calmer" than that experience!