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513019 is the part number for Timken, SKF, and BCA. You can find pretty good prices on hubs here.
I would usually agree with you that Rockauto has some of the best prices but if you shop around you can actually get the wheel bearings for cheaper than that. CorvetteRecycling carries the rears for $99 each (AC Delco) and you can get the fronts from autozone for around $160-$180 (Timkin).