Use your local library rather than buying books. If you do want to buy a book, go second hand and charity shop.
Completely agree about catalogues. And take a shopping list with you when shopping to avoid impulse buys.
Use your freezer to the full. It's cheaper to run like that and you can freeze the things you have got on special offer.
Always for the value item. Cleaning materials have a huge spectrum if prices.
Cook your own. It's better for you and much better value.
Likewise entertainment. A home made pizza on a Friday night in front if a family video is great.
If you need really cheap decorations for Christmas, try your pound shop. No one will know.
Make your own Christmas presents for the ILS etc. Much more thoughtful.
Get the children to make Christmas cards with you. Ditto.
Turn off the lights when leaving the room.
Have a common piggy bank for small change. It's remarkable how it mounts up.