Hi, some ideas, sorry if they have been mentioned before.
If you get a letter and the stamp hasn't been franked, carefully peel it off and use it again.
If you get a reply envelope inside a letter, stick a label over the address and use it for something else.
If you are near a library with a newspaper and magazine section, go and sit in the warm for an hour or two and read your daily papers. Our library also has free half hour on the computers.
If you have spare sets of curtains, hang 2 pairs on one window for extra thickness in the winter.
If you live near a town that has a refuge for the homeless, volunteer to help out over their busy Christmas period, they feed you as well.
Be a blood donor, you get a free drink and biccy, it makes you feel good as well because you have done something to help others.
Bye for now
Ilona