We spend under £100 a week for 7 of us and the 7 pets and the stuff I buy for the wild birds in the garden.
I never buy out of date food and it doesn't usually include reduced items(because I can hardly ever find any)I'll never shop at Tesco though I've always found it expensive even when I worked there as a teen and had a discount card.
I use Asda and Lidl and sometimes Iceland for things like flavoured water,they usually have special offers on the kingsmill breakfast range,Ice lollies and Ice cream and they sometimes have really cheap offers on things like crisps.
I use Poundland/Poundworld for sweets(chocolate bars)for the children,cleaning products(2 large bottles of morning fresh washing up liquid for £1)crisps if they work out better value there than the supermarket,kitchen towel,tissues,toilet rolls,food bags,black bags,treats for the 3 Dogs,the Cat and food and seeds for the wild birds.
We usually use the butcher for our meat except for bacon,sausages and burgers.
Any meat pre made products like sausages and burgers have to have a very high content of meat,I won't buy the cheap one's.
Our butcher offers free delivery which is handy as it's about an hours drive there and back.
The pet bits for the Rabbits and Hamster we buy from a local independant pet shop(alot cheaper than Pets at Home) and they offer free delivery as well.
I know were very lucky to have a lidl and a poundland within 10 minutes drive and Asda and Iceland is less than 20 minutes drive and they're both right near each other.
I don't go looking around all of the stores,I open up different windows on the computer and compare prices whilst I'm making the shopping list.
Starting to make a Meal planner(I never thought to do that for years)is most probably what's saved us the most money.