Loud clunking sound front passenger side when accelerating

I have a 2011 Prius with about 50,000 miles on it. Since the last oil change, it has started clunking loudly when accelerating (either from a full stop or from a slower speed). Sometimes the clunking is louder than other times, but it is only on the front passenger side. I can often feel it though the body of the car. I just moved to a new area and don't really trust my closest dealership service department, so I want to know something about what this could be and how much it might cost to fix. Input appreciated!