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This looks like a decent deal that I would have jumped on a few years ago (before I picked up a dfa*300):

TAMRON SP AF 70-200mm F/2.8 Di MACRO LENS for PENTAX - OPEN BOX DEMO | eBay

I've bought a few things from Prodigital2000 before, the are the online face of a Brick and Mortar shop in Ontario. No mention of a warranty, but I assume they are an authorized dealer so you might want to ask (also ask about a possible restocking fee on return, I've never had to return anything to them so I'm not sure).

Prodigital's listings of Pentax items has been sadly declining the past few years.