Any kind of nuts and pb are red flag foods for me. Not because a FEW of them is so harmful but they are a food I just can't seem to leave alone once I start.
My supermarket does have a sugar free pb but unfortunately it's also salt free which makes for very bland flavor. I've tried adding a bit of salt and Splenda but this stuff is like glue and will stick your mouth together...not such a bad thing afterall.