I buy off brands whenever possible. The savings really add up. A few things, like cereal, I just don't like the off brands so we go with name brand but use coupons.
Use your bags from the grocery store. I put larger trash items (like milk cartons and big boxes) in these and take them out immediately. I use a lot less trash bags this way.
Always ask for a student or senior discount if it applies. Some places give these types of discounts even if they don't advertise it on their menu or price lists.
Homemade cleaning solutions are usually very cheap.
Precook and freeze a few meals so when you're in a hurry you aren't tempted to eat out to save time.
For entertainment, try going to a park instead of a movie. You can take your furbabies and have a great time!