I also have heard about unplugging appliances and things when you're not using them. I started looking around my house after I heard that and geesh...the things we leave plugged in. Toaster, microwave, sometimes up to 3 phone chargers, fans...all type of things. I went around and unplugged everything but SOMEONE seemed to follow me and plug it all back in.
If you use conditioner, another trick is to put a small amount in a big plastic glass and fill with water. (as much or little as you feel you would need) You use less of the conditioner but with the water spreading it out, get the same result.
There's the old fashioned way of conserving soap with smooshing soap bits together instead of throwing them out when they get so small.
Anything liquid I will rinse the container out before tossing so I can get that last bit out. Shampoo, dish soap, laundry soap....anything like that.
I don't really buy in bulk but when I see the family size packs of meat on sale, I will buy those and split it up and freeze. My store also has a section in their meat department with clearance items. I check there first because it's still good and if I use it right away or freeze, it will be fine. I also buy some meat at a local convenience store. For whatever reason, they have great prices on ham steak, hotdogs, smoked sausage, etc. Much cheaper than the grocery.
Also for meat, if you can swing it up front and have a deep freeze, getting a side of beef (or even a full cow if you have room) is very economical in the long run. Depending on the size of the cow, all of it will average around $2.00 per pound. Kind of pricey for some cuts but very cheap for other. Plus, it lasts a long time and is much leaner than the pre-packaged meat at the store. You can usually tell them how you want it done also. So much ground beef and what size (1 lb packs or 2 lbs...whateve you want), how you want things cut, how lean etc. I do recommend though that you ask for SOME fat on the cuts...even the hamburger. When they cut it lean, they REALLY cut it lean and there is sometimes hardly enough fat to cook it without burning it.
Get a subsription to your local or nearby Sunday paper. The subscriptions are cheaper than buying them individually each week and the coupons and/or ads will make it worth it, if not pay for itself.
Bales of straw around crawl spaces or older foundations can do wonders for insulation also.
If one side of your house seems to be colder than the other side due to winds, plastic over the windows will help cut back on heat loss. You can get the rolls of plastic sheeting at hardware stores and use duct tape or strips of wood to attach. Or you can buy the kits that you cut the plastic to size and use the hair dryer to make it stick and shrink tight.