Good choice on the tea!
I don't buy much groceries in bulk... I did buy some Annie's organic mac and cheese (though I hear the white cheddar is better), since it is very cheap and somewhat healthier (but not by much) than the Kraft variety. One of the best things I've ordered was these tins of salmon. Very delicious, great for a quick lunch. You don't even need to microwave it.
Oh, also, I'm considering buying a bunch of the granola cereal I eat in bulk. It's still somewhat expensive in bulk, but almond and dark chocolate granola is maybe my favorite snack ever and I might succumb.
My favorite thing on Amazon is the St. Dalfour ready-to-eat meals. The salmon variety is my favorite... makes a lunch by itself or I can toss it over rice for dinner. I also buy ramen (bought a pack of 24 for $5, though I can't find it anymore), granola (cheaper in bulk online), and sardines.
Amazon is great for things you can't really find in bulk or foreign foods. I buy soba noodles and miso paste but the shipping is usually pretty bad (I think they have to overnight miso).