formal gowns

I hate to be the person to ask this, but I even searched it in the search bar and couldn‘t find answers. Does anyone know of stores really similar to Lulus and Windsor that sell formal gowns for around $100-$150? Not prom girl or David’s bridal, something a tiny bit more casual and cheaper. I’ve been googling and searching but not a lot of luck.

I will say I am a HUGE thrifter. 90% of my clothes are thrifted but I’m willing to spend more money on prom. Thanks for the answers!