The Big Block still shows as available through the Basspro Cataloghttp://www.basspro.com/webapp/wcs/st..._SearchResults
If you've got a store nearby you can save on the $45 additional shipping.
If you really want one it looks like there is still a chance. Who knows how much longer you'll be able to get these.
As popular as they seem to be I find it hard to believe someones not going to pick up the product line and start to make them again? But since I've got the business acumen of a road killed 'possum, what do I know?