I buy Adams Peanut Butter in our regular grocery store. Not too expensive. Just peanuts and salt and comes in glass jars.

I'd never heard of aflatoxin before, OakLeaf, and your comment made me curious enough to look it up. At least in the US there have been no reported cases in humans and only sporadic cases in animals (per the FDA), so I'm not too worried and I'll go on keeping my PB at room temp for now. Our PB gets consumed pretty quickly anyway.

Rebecca - thanks for the great tip on the peanut butter hand mixers! My knife has served me well so far, but that gadget looks tempting!

Who knew that peanut butter would be the subject of such a lively and interesting discussion!