Obviously you have to give supermarkets money if you want to buy things from them, that's a given (of course, there are other places you can buy stuff too, and I'm all for shopping local and supporting local businesses,etc, but today im talking about supermarkets)
If you shop somewhere, and are likely to return, sign up for the loyalty card. Sainsburys nectar, Tesco clubcard, etc
- this means you get to earn points as you shop
- you'll also get sent vouchers/coupons either in the post, or printed out with your receipts at the end of a shop
Work the system. I don't shop in sainsburys that often, I find them more expensive for the things I buy. But I have a nectar card and pop in every so often, then that means I often get print out vouchers enticing me back. Like spend £15 and get 400 bonus points. I combine those print outs with offers on sainsburys my coupons and I'm quids in. (more on that below)
https://mycoupons.sainsburys.co.uk/ Can't get links to embed nicely. You need to sign up for an account and link your nectar card, but once you have, you get a virtual wallet which you can fill with up to five coupons. Next time you go, spend the money or buy the items that qualify you for those offers, wait a few days - make sure you leave the coupons in the wallet until you're credited with your bonus points. If can be offers like 40 points if you buy a certain product, or say 450 bonus points if you spend twenty quid. If you ever shop at sainsburys, it might be worth a look.
Tesco orchard. You'll need to google that, but it should come up easily. Putting links in this post isn't happening today I'm afraid. This is a site which runs campaigns. Basically, you answer some surveys and then they'll match you up on campaigns that might interest you. Currently I'm on one where they've sent me some vouchers to buy exotic fruit and then tell people about it! There's slightly more to it than that, but they talk you through it all in a friendly way.
Know your prices. I know that sweet potatoes are cheaper at Aldi, so I generally buy them there. There are other things I can't get in Aldi, or prefer from Tesco that I buy there. If you can, know prices and shop around.
If you shop in asda, always go online at least three hours after your shop and check the asda price guarantee. You may be entitled to a voucher if your compatible shop was cheaper elsewhere. There are a few terms and conditions, but super easy to do. You need to have bought at lest eight different items