Ready made house hold items are very expensive. Want solution?

Why they are expensive? Because companies even charge rents of their buildings. Also they are made by professional labor.
Then question is that is there any easy solution for it?
Yes, there is a solution and its simple. You only need spare time from your busy life and necessary tools which are normally present in house.
Working start with necessity. As necessity is the mother of invention.
Thats enough for theory. I will show practically by making a gas heater made with house hold items that consume
Very less gas.