2005 Ford Explorer I was told my SUV needs sway bar bushing

This is a one owner car, light driving. Took it in for regular oil change and said it makes a noise when going slowly over a speed bump, kind of a squeek up front It only does it once in a while and only when the wheels are straight. They said I needed new bushings and the cost=$300.00. New bushings at 33,023 miles? They also told me the oil pan plug was "worn out" and charged me $11.00 for a new one. I think this is the "she's only a woman" syndrome and they see a chance to make a buck. Also- the owner just got a walloping fine from the EPA for tearing down a building full of asbestos. Should I get another opinion?