Try to always check the prices out online before parting with your precious cash. Price research and Honey will help, Kiwiwallet you will also get cashback. Winning all around.
So much money can be saved in just this one area! Groceries is a huge one, as is drinks while you are out and lunches etc.
There are two ways to attack this, to reduce the amount of power you use, and secondly make sure that you are getting the best price for your power.
An easy way to see if you are getting the best deal for the broadband that you need.