I think that my local Sainsburys hate me. Every time I go in, I find these BOGOF deals, partner up with someone who only wants to buy one, and sort it out at the checkout!
I also make myself a real pain in the arse and take a calculator with me, so any different size packages also gets analysed, and then I tell people also buying the product. It is such a con, it really makes me angry! If price for a single item goes up noticeably between shops, I then ask to speak to the manager and accuse them of over pricing, and disenfranchising the elderly etc etc who only want to buy one. I also HATE with a vengeance, those tickets they give you saying "your shop would have been £2.30 cheaper"at another shop "here's a voucher you can use next time" and then date it so short that you can never redeem them! I have taken to doing my shop short of one or two items and then if I get one of these vouchers, I put my groceries in the car and go straight back in to get a freebie! They must hate me mustn't they? Ha ha!