Never buy anything full price if I can help it, will usually try and wait until there is a special offer/ sale on.
In the supermarket, chop and change brands depending on what is cheapest at the time or will leave buying something 'til next time if it's not reduced enough.
I also stock up on the cards 7 for £1.
Use quidco/ topcashback, and discount codes for all internet purchases. Look for vouchers online if we're eating out/ doing something.
Hang up clothes instead of using tumble drier. Walk instead of drive when I can. Lidl nappies and asda/ morrisons value wipes at 18p a pack - both brilliant!.
Always look at the reduced section in shops. Clothes have to be at least half price (but usually much less) unless I need them for a specific occasion.
Buy mobile phone top ups in Boots to use vouchers and get points.
At xmas, regift wine and chocolates if I can to save buying more.
Hard to think - it's so ingrained in me to be tight, that it all comes naturally! Some of these things will readily admit to, others not so much.