The best way to find "actual part costs" is to survey local shops near you. It doesn't matter what price I could tell you -- it's not real for Washington state!
Check with some local repair shops near you, and compare.
www.repairpal.com/repair-shops
RepairPal Certified shops can diagnose and repair your 2008 Toyota Prius. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.