I was quoted $550 to replace the pitman arm, the idler arm and bracket, and...

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an alignment. Does this sound right? I am not thinking so at all. Especially when I am finding a pitman arm alone for only around $40 bucks and the estimate says $80 and the labor cost is $250 for two and one half hours which this is only about an hours worth of work. I may be a disabled woman, but I haven't been disabled long and I sure as hell haven't always been called a "lolie" woman; a tough SOB yes, but not delicate and naive. I worked on small engines myself and these people were trying to pull my chain, or cane I should say :) any thoughts? Oh, and also,I wasn't even sure if this was the problem: the guys that replaced my transmission I found out ended up joy riding in my truck for over 150 miles and this noise (like a slight roaring coming from right under the hump in the floor board in center toward front) was not there until AFTER I picked my truck up so I assumed it was the transmission and had taken it back the next day where I was told it was a bad wheel bearing which was bull because I knew better for one, and for two, they had already been replaced. Could a wheel bearing had even made a roaring sound where I am talking about anyways? Did he think I am that stupid? Any thoughts?