Is there single packs of peanut butter swirled with regular butter?!
No but go talk to a resturantm gas statation or even your local grocery store or somewhere like that about buying butter "pats" packages and little peanut butter and even jelly packages by the case. Yes it is a lot to buy at a time but it is totally doable.
I've never seen singles of PNB swirled w/ jelly. I have seen JIF To Go of just PNB, though... and maybe you coudl talk yoru local McDonald's or local diner out of individual jelly packets.