It really depends on the type of setting- and who produces the setting.
You would need to start with some popular vendors and determine if one of your local jewelers can replicate the setting.. good luck!
It depends on the gram weight of the ring, the shape of the baguettes (straight versus tapered), the size of the baguettes (the bigger they are, the higher the per carat price), the quality of manufacture and workmanship, and who the maker is. Some company's products bring more than others, and designer workmanship carries a hefty premium.
I've heard tradeshop.com recommended as a good place to get setting estimates. I'm not familar with them myself, but I haven't heard anything bad about them. You might be able to find out what you're looking for through them.