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The Canadian ebay seller, prodigital2000 is selling the Tamron 90mm Macro lens for $299US including shipping in Canada and the USA. 6 year Tamron warranty is included for Canadian buyers. I don't know about warranty access from outside of Canada. I have bought a few lenses (including this Tamron) from this seller - have not had any issues, have not had cause to use warranty.

New Tamron AF 90mm F 2 8 Di SP Macro Lens for Pentax DSLR | eBay

[traxino]

Now it is $295.