Kristin bought her Maggie Sottero dress for $800 last year. She recently got laid off and has to downsize her wedding, so now she's asking $400 for it. Courtney purchased a satin halter Nicole Miller number for $455, but her engagement didn't last and she's hoping to unload it for $150. Jen got married in an ivory, A-line, $2,000 Monique Lhuillier design; now a bride-to-be can snap up the (gently used) dress for $1,500. These gowns are among the 1,400 or so currently listed on Emily Newman's Atlanta-based website www.oncewed.com. She started the free listing service last March to pair sellers with bargain-hunting brides. (Wearing a used dress is also a nice option for those brides planning a green wedding.) There are 10-15 new dresses listed each day, Newman said, and savvy brides can search by street size, designer, or style number. Once you know what you're looking for, you can prowl eBay, Craigslist, and myriad sites like Newman's, including www.woreitonce.com and www.savethedress.com, and comparison shop to get the best deal. It's a good idea to try on a variety of dresses and designers at a local bridal salon, so you know how each style and size fits - most online sellers don't accept returns