If you do not want to spend on apples and bananas, then you can always go for other alternatives. The best alternative for ripening avocado is applying/ spraying artificial hormones. The hormone we are referring to is ethylene, the same hormone you can get on bananas and apples. But before that you need to cut them off the trees and store them together in a room. Ethylene boosts the ripening process. Spraying them on the outer skin of avocados will make them ripen faster.
A unique thing about Avocado is that it does not ripe while it is on the tree. Inorder to rip it, you must cut it off the tree and the ripening process will start. Avocados do not rip quickly. For boosting the ripening process, you can place it with banana and apple. You can use plastic bags or you can mix up buckets of banana, apple and avocados to boost the ripening process. It works because the ethylene hormone from banana and apple boosts ripening.