I buy my nut butters (almond, sunflower, and cashew) all in glass jars, at the natural foods grocery. Expensive, but worth it. Every time I've tried buying this stuff at my grocery store (which is quite good, overall), the taste sucks, or I find some hidden horrible ingredient.
I don't refrigerate, because they just turn into hard rocks. I haven't died yet (been doing this for years). You scared me, Oakleaf.