Are 17″ MacBook Pro for sale by Apple?
Here's your answer:
Apple discontinues 17 inch MacBook Pro

From the site:


  "But if you’re looking for a reason why Apple offed the 17-inch now, you need go no further than the 15-inch Retina display MacBook Pro. Not only does it offer the most cutting edge technology of any Apple laptop to date, but its 2880-by-1800 pixel display outstrips the 17-inch’s 1920-by-1200 resolution with room to spare. Add in the fact that the new MacBook Pro is thinner and lighter—to the tune of more than 2 pounds—and it seems pretty clear that the Retina display model is the new target for what a powerhouse portable should be."