If you wish to buy new front doors, one of the easiest way would be to search for information about average prices on the Internet.
There are many advantages of using double glazed doors, first of all, they help to keep your house warm during winter, and at the same time, they can help to minimise external noise from entering the house.
You can also do your part by helping the Earth. If you wish to customise your windows & doors, you may want to search for a local supplier to help you out with this.
More and more people are investing in these windows, and before you do so, learn more about the double glazing prices first. This will help you to save money.
Do realise that the same products may cost differently with different suppliers, this is probably the best chance for you to learn more.