Wedding dress alteration costs (specific details inside)?

The prices vary so widely depending on where you're going that there's no way for anyone to give you an accurate ballpark. Some shops charge hundreds of dollars, while others try to be modest. I will tell you that chains like David's Bridal will charge a lot more than a local seamstress or even a smaller, more independent bridal shop. All places that do alterations will have a listing of their prices, you can request that and get your ballpark from their list.