I got a gasket set one time from ebay way cheaper than the dealer wanted for one, this was not for an old truck I think it was a quarter of the dealer price if that much.
I was very happy with it and all is still good over a year since using it. So cheaper can sometimes be just as good as costly.
Another thing, lots of times at the auto parts stores they have the pricier and cheaper part, many times the cheaper part is way better than the pricier one, as I checked both out to see the difference. So paying more isn't always the best in the auto parts world.
