1999 Ford Windstar lower control arm

I just had a left front lower control arm replaced the bushing where it attaches to the frame was shown to be worn. The mechanic said that the whole assembly needed to be replaced. He told me that the bushing could not be separately replaced, so I agreed to the work. The cost of the arm was $325.99 and labor was 90.00. Looking on the internet to see if paid too much for the part I saw the bushings for sale for $11.39 and the control arm for $80.
Did the mechanic misinform me (lie?) Or just hose me on the cost of the part?