Not specific to any supermarket, and apply to the manufacturers and other products.
I like Coffee Mate. I know it's not good for me, but I don't drink a lot of coffee. Before all this started a carton was 500g for around £2.35. In the last twelve months it has been repackaged, reduced to 450g and increased to around a pound dearer. It is now 325g and £3.45. I know they have had production problems but .... Fortunately I found some 800g at a bargain price in Iceland and hope the situation will resolve before I run out. I'm guessing Nestle make the supermarket brands as well, they have been missing for a long time.
Apply similar story to Nescafe Azera Americano coffee. If you like this, it is £6 for a 90g tin at Tesco, but currently £4.99 for "Everyday Low Price" 190g.
It's not the supermarkets who are profiteering, and we know producers faced issues at the beginning of the year, but come on!
A one kilo tin of "original" Coffee Mate is available from Amazon for £14.99 - don't know how that compares to what you pay in the shops and it's probably too big a tin for Frazz , but Mr Y must get through it quickly, especially if it goes on fishing trips as well as to work.
I can’t bear milk but happily add a flat spoonful of coffeemate to my coffee. I only have one cup a day, as a rule, so the large tins last me for ages. However, I’m now trying to track down the “less fat” version before my current tin runs out. I’m sure I’ve bought it from a supermarket in the past but I can’t remember from which one. The ones I shop at now only do the full fat version. But I guess one spoonful of the full fat one won’t do me any harm if I can’t find it.