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Authorized Tamron USA dealer BuyDig via eBay has a bundle of the Tamron 70-210mm f/4 Di VC USD for Canon with bonus accessories for only $499.00. This is a $100 savings vs. the regular price seen at other dealers, and it comes with a number of free items: a SanDisk Extreme 64GB SDXC card, a bag, tripod, and cleaning kit!
As BuyDig via eBay is an authorized Tamron dealer, this comes with the Tamron 6-year warranty.