I found out about Wild Pacific Seafood http://www.pelicanpackers.com/ (aka Pelican's Choice) from the Monterey Bay Aquarium's Seafood Watch program, which includes resources for buying sustainably harvested seafood.
Wild Pacific Seafood has one fishing boat and they catch albacore via the trolling method, which is listed on the Seafood Watch card as a best choice. Troll-caught tuna are younger and have lower mercury levels than longline-caught tuna. Trolling produces less bycatch than longlining or purse-seining.
Anyway, they sell several flavors of canned albacore in pop-top cans. The OH and I buy the no-salt-added variety, 100% tuna. It's expensive compared to regular supermarket tuna, but a can of this stuff goes farther than a can of supermarket tuna, which has a lot of water in it. (And our cats, shockingly, don't seem to like tuna water.)
Every time we place an order (we usually get two 24-packs, which works out to $2.75 per can), they include a hand-written letter. Sometimes they include a sample of a different flavor.