For the screen itself, there are different qualities of screens, and they cost different prices. I usually use Parts-People, they exclusively sell Dell parts, at a lower price than Dell will give it to you for. Here's a [http://www.parts-people.com/index.php?action=category&id=148&subid=219&refine=lcd+screen|list of Dell Studio 15 screens] from Parts-People.
If you take it to a shop, expect to pay a few hundred bucks for the part and labor. Replacing it yourself would be the best bet for price. Parts-People also has guides on how to fix it yourself, [http://blog.parts-people.com/2011/04/01/dell-studio-1535-1536-1537-lcd-screen-and-rail-removal-and-installation/|the guide for replacing the screen is here.] It may look tough, and probably is, but if you're on a budget it's probably worth it.