Tesco did a 3 pack of Jaffa Cakes not long ago for only £1. I've noticed Ginsters have toyed with massive price adjustment too. I fear it is price testing to find the new critical price point to maximise profit. It is nothing more than market optimisation on a product with elastic demand. They might sell less at a higher price but overall profit increased.
Manufacturers are getting squeezed from higher supply costs and lower consumer spend.
I'll abstain from Jaffa Cakes for lent, or until the price drops, whichever is the sooner!
Regards
Sceptre