[vetsgt02]

if you see a mantle ball in good shape for sale for less than 500, most likely it's fake

I disagree with this. I have been following Mantle Balls on EBAY for the past 3-4 days and out of the last 7 sold graded by psa on ebay 5 of them sold for under $500. So while I agree with your base point of be careful because Mantle is the most faked athlete out there I disagree with the possibility of missing out on a real steal.