I have never seen a wheel bearing for $40,except of course the old style tapered roller bearings you have to pack which you can do for about $15. But your car has a sealed hub unit. Now alot of people are going to tell you aftermarket parts are just as good as oem and in some cases they are but from my experience hubs are not one of those parts neither are fuel pumps. Another thing to remember when he gives you a price on a part he is going to mark it up above his cost some, he has to make money to pay the bills to keep his shop doors open. In most cases his cost is cheaper than you can buy it. Also he may be quoting a price for an oem part.