I was thinking the same thing. The old link doesn't seem to work anymore.
http://www.amazon.com/gp/product/B01516M9HY/
This was the Walmart link ->
http://www.walmart.com/ip/Pepsi-Perfect-Cola-16.9-fl-oz/47300585
I managed to get one on Oct 21, 2015 from Amazon. They screwed up and were charging people Prime members for shipping. I placed my order w/ the $7 shipping charge anyway, because I didn't want it to sell out. Sure enough it sold out minutes later. I just contacted Amazon support via their chat and they credited me the $7 for a future order.