I'm almost duped at Midas

So I go to get my brake pads changed and the guy at Midas says he can't do it because the hub is loose and it will cost 700 dollars to fix it. I actually started to believe him because he had this tone of "from one mechanic to another". I know a good bit about cars and am never afraid to hop under my car and fix something. I do some reading in my Haynes manual for my truck and find that the hub and bearing assembly is "sealed-for-life" and the whole thing needs to be replaced as one. So I call Autozone and get a price on. You won't believe it........$72 dollars!
1 hour later the part is installed on my truck.