-I don't buy small trash bags, just use Walmart/other shopping bags.
-I don't pay for air in my tire, but there's a free pump at a local gas station for me.
-I don't pay mechanics unless I have to. Last time I took the old girl in, it was a $350 bill without labor for a part that I ended up buying at O'Reilly's for $8. Of course, this requires the use of helpful fathers and time to learn how to maintain your car.
-Follow Granny's method and reuse Tupperware/jars obtained from butter/other groceries.
-I've learned to look for digital copies of college books. I bought an $85 book for $13 on Google Play.
-Another tip from Granny, don't sign gift cards. Leave it blank so that they can reuse it as a gift for someone else.
-Buy your cellphones out right. A lot of contracts will end up costing you more in the long run- but then again, I try to keep monthly payments as low as possible and pay for things out right whenever I can.
-I've never been a Black Friday shopper, but now everyone's pushing for online sales. You can get your hands on brand new appliances like a refrigerator for extremely discounted prices without leaving your home. I was able to get a new fridge and dishwasher for my parents last Christmas because they came as 'buy one, get one.'
Most importantly...
-Take care of your things so that they'll last longer. Nothing lasts forever but if you take the time to maintain it, you can extend the life of items far beyond their typical expiration date. My car that I mentioned before is a '97 with 337 thousand miles on it. I mean... it wasn't all just me... God has performed a few miracles on her too. By every form of science and logic, my radiator should be empty right now because it was leaking faster than you could pour. But it's not. I figure God just plugged it with his finger for me... I have no other explanation.