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From the same seller, bigvalueinc, that offered a K-r body for 8 grand, we now have a lens to go with it;
Sigma 50-200mm f/4-5.6 DC OS HSM High Performance Zoom for Pentax 0085126686611 | eBay
A quick search on eBay shows the current price of this lens (new) as $199-$229 USD, from everyone besides bigvalueinc. They obviously have their own "blue Book".
Maybe they'll knock it down a bit for Black Friday?
Ron