Sites for reasonably priced, decent quality dresses?

I have a hard limit of about $1k for the wedding dress. I am not opposed to a used one, however I don’t think that option is very widely available in my area. I am okay with buying online, but I am a little wary of some of the sites that have $300-500 dresses as I’ve heard that a some of them are scams. Does anyone have experience buying online? Does anyone know of any good reasonably priced sites?