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I just saw a post on a Facebook page from Jerry at Lumberjack. He stated that Cabellas pellets are rebranded Lumberjacks. Not sure how long they have been doing that, but if you have a Cabellas near you, that may be an option. He also said that Char Griller will be rebranding Lumberjack pellets.
Your other option is a bulk buy through bbqpelletsonline.com (best possible pricing too), but I'm not sure how it works from an international perspective.