Blue/grey prom dress

I’m selling this blue/grey sequin prom dress with an open back! I bought this from a local boutique for $500, they didn’t have my size so I bought a 4 and was going to get it altered. I found one that fit better and the boutique I bought this one from doesn’t take returns. For size reference, I’m usually a 0, I’m 5’9 and 120lbs. This does not have any alterations and I’ve never worn it other than to try it on when buying and to take this pictures!