What is the cost of changing wheel bearings on a 2005 Scion XB?

IF you can find the rear wheel bearings, you can do the job yourself pretty easily. Only four bolts hold the rear wheel bearings in on each hub.

I had to search and finally found some bearings for about 150 dollars apiece on eBay. A number of scumbag online sites said they had the parts in stock (even when I called and spoke to a human), only to tell me a few days later, after they had my money, the parts were not in stock. But I digress.

Jacked up the car, removed the rear wheel and drum. You crawl around underneath, remove the ABS sensor, and use a 14 or 13mm socket on an extension to break the bolts loose. Once removed, the bearings slide outward. Replace with new bearings, torque to 46ft lbs, and reinstall the ABS sensor wire. Remount the drum and wheels. Total time to change them was about an hour. Last step is you want to take the car in to have the wheels aligned, and you're good to go.