USA retailers:

Columbia, MO - Midway USA
Mexico, MO - Graf & Sons, Inc.
Montezuma, IA - Sinclair International, Inc.
Oroville, CA - Huntington
Rapid City, SD - Black Hills Shooters Supply

http://www.norma.cc/en/Aterforsaljare/Aterforsaljarsida/?countryid=USA

FWIW - speaking of S&B "regular" bullets - such as SPCE, you'd be surprised how many game is shot here with those - those are non-premium - plain jane - cup&core, rather soft - tho I wouldn't (didn't - my father was shooting those for 2 decades and I started my hunts with those) mind using them according to their capabilities. They lack on hardest quartering shots on big stags, bears and boars - work splendid (without exit on big stags, bears and boars shot on the shoulder) on side shots. Should do just fine on Whitetails IMO.

On the other hand S&B does load Nosler Partition for mentioned calibers - see here:

http://www.sellier-bellot.cz/rifle-ammunition-with-nosler-partition.php?product=31&view=all