With the economy the way it is, here are some options First get pic and price PROOF AND WHO IS SELLING IT
Take pic, price proof information to bridal shops near you. Maybe they will beat the price or give you good discount.
Try going to the good thrift shops and formal rental places. A co-worker got her wedding gown for 75 bucks.
A wedding gown almost always needs some alteratons. What is a gown with alterations going to cost if you buy from a local retailer?
If you order one online, then what it is going to cost if you need alterations done. A bridal shop may do them free if buying from them, but to bring one in, they may charge a arm and a leg.
Now what you can do, is to see if Online seller has a retailer nearby that sells the same gown. Or, you can ask a local retailer if they will order the gown for you.