Help! Dress websites?

Hi Ladies!

So my boyfriend and I are going to his sisters wedding next month in Colorado. And since she is in another state, I haven't met her yet (I've talked to her over facetime, but not in person!) my man is standing up in the wedding as long as his other sister who is one of my good friends. I want to look super cute yet a little sexy. But nothing to crazy cause this is my first time meeting some of his family, and I'm representing him as well. And since it is an out of state wedding for us, financially it's expensive. Any one know where I can find a dress (for rehearsal dinner and the ceremony) but not break the bank? 🙄🙁 thank you!❤❤ websites. Stores. Wherever you got!