Car is 2003 model, has 120,000 miles on it. Change the oil regularly and attend to routine maintenance. 'A stitch in time saves nine...'
Bought my phone outright and have a payg account.
Buy canned tomatoes and beans, and frozen fruit and veg - bulk shop if on sale, ditto pasta and big sacks of rice. I rarely buy fresh fruit any more, with the exception of citrus, bananas and apples. Big tubs of plain Greek yogurt are often cheaper than individual pots and you can make smoothies with the frozen fruit.
I freeze bananas that have gone too ripe and use for banana bread. Slice lemons and limes and freeze.
I buy bulk herbs and spices, nuts, dried cranberries, and couscous from my local Whole Foods Market.
I shop in Aldi for canned items, grated parmesan cheese, some household goods in the centre aisle of wonder and magic (big dutch oven for $29.99 < hellllooooo > and next Wednesday DS will be there when they open to buy a dehumidifier for $199 that would be 50% more expensive anywhere else) and nice frozen green beans and peas imported from the Netherlands but still cheaper than I can get them anywhere else. Aldi also sells German choc and that is where I get Christmas treats for the DCs' little stockings (family tradition).
I have a bread machine and make dough for pizza, cinnamon rolls, bread.
I use rolled up balls of tin foil instead of dryer sheets.
We eat lots of soup and stews, heavy on beans. I batch cook and freeze. We do not drink sweetened fizzy drinks though I love fizzy unsweetened water/seltzer and I buy the cheap store brand.
Meal planning - check..
Buy lots at the Dollar Store (US) - big bag of name brand ginger snaps for a dollar, box of 36 nasal decongestant tablets, 100 ct aspirin, acetaminophen, 20 imodium, 30 midol, nail polish remover, boxes of 160 tissues (name brand), name brand toothpaste and toothbrushes, bags of 100 cotton balls and boxes of 350 q-tips, name brand plasters, boxes of cake mix (name brand), small bottles of name brand salad dressing (snapped up Paul Newman dressings when they appeared one day), little jars of decent seasoning like Montreal Steak seasoning, containers of sea salt/kosher salt and lots more. All a dollar for each item.
Virtually all of my clothes are from a charity shop, and lots of my footwear too, and handbags and coats/jackets. I have also bought kitchen stuff (set of mason jars in different sizes for storing bulk dried lentils, beans, couscous, etc) and items of furniture there - bookshelves, a slipper chair for DD's bedroom, and a nice mid century coffee table as my old coffee table now serves as a stand for my herb pots when I take them in for the winter. I grow herbs for cooking, leave them out in summer and nurse them through the winter in a bay window.
Other stuff (less than 5% of what I own) comes from the clearance racks of discount places like TJMaxx or Burlington. I recently got DD4 a graduation dress for $23 from the TJMaxx clearance rack. I got DS a suit from Nordstrom Rack for just a little over $100 two years ago - down from about $650, and they measure properly and do alterations there for a fixed price per alteration that is far cheaper than taking a suit to a dry cleaning place that does tailoring. I have got very good at altering clothing to fit, and will take in DD's dress for her, but won't touch a suit.
I cut and colour my own hair. It's curly and forgives a lot of cutting mistakes. Also cut all the DDs' hair if they ask.
Use cloths for cleaning and polishing, wash with the regular wash.
I have a mop (bought at Aldi) with washable and reusable mopheads.