Although not every pump may have the sticker, all refineries in the lower 48 stopped making non ULSD a while ago and it's required at all retail pumps in the US as of Jan 1 2011. So you should not find non ULSD any more except in Mexico or off road only fuel.
http://www.myturbodiesel.com/1000q/DPF-Adblue-FAQ-VW-Audi.htm This is the system most affected by non ULSD, it can clog the exhaust filters quickly.
http://www.myturbodiesel.com/1000q/DPF-Adblue-FAQ-VW-Audi.htm This is the system most affected by non ULSD, it can clog the exhaust filters quickly.