A preowned dress has most likely been used only once, so if you dry-clean the dress, then it's bound to look like new. Take a look online at sites like Preowned Wedding Dresses or RecycledBride to see what's available. You'll be able to get a high-end gown at a cheaper price! But make sure to factor in the risk of online transactions, do your research properly, and grill the seller.
Source: Steve Cowell Photography via Style Me Pretty