Use this link to find some shops near you that can help with your concern:
www.repairpal.com/repair-shops
Contact a local repair shop near you for real world quotes. There are many factors involved -- you didn't even indicate where you live -- and that could be important also.
RepairPal Certified shops can diagnose and repair your 2007 Toyota Prius. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.