The 17" has disappeared from Apple's inventory, although you may be able to buy a refurbished unit. There has been a long discussion here about the apparent demise of the 17"... you might want to search for it and join in the others who are writing to Apple pleading their cases for bringing back the 17".
Didn't find the discussion, may be you have link?
It's seems so irrational to remove most pro macbook among macbookpro's. I can't really undesrstand that decision and I also can't understand why they did it silently? They didn't have a proper reasons that are good enough for explanation? So perhaps there are is NO reasonable explanation?
~~"So perhaps there are is NO reasonable explanation? "
there are countless reasons, as mentioned in that very long thread.
17" is "bye bye"