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First let me caution you. You can not learn a martial art, Online, from a book, or from a DVD. There is no substitute for a qualified instructor. If you try you are just wasting your time and effort.

Some classes will help on tuition, also you may have the option of "working off" your fees by cleaning the Dojo or some other routine chore. The worst thing they can do is say no, so why not find out.

train yourself using online videos. Much of martial arts is strength and flexibilty training that you can do at home. Many of the basic punches, kicks, blocks and other strikes you can learn from videos online for free. I would recommend you do some research and teach yourself a few basics you can practice, but focus more on your physical fitness training. Go very slowly.

Another option is that many dojos offer a free week of introductory classes. You can go and learn the routines they are doing and then practice them at home. You could return and do drop in classes to learn new skills to practice.

Also, you can sometimes talk to the sensei and let him/her know you are broke. It is a tradition in some of the cultures that a person who wishes to learn can sometimes trade work, such as cleaning the dojo daily or running errands for the sensei, in exchange for training.

Check your local community centers. They should be able to tell you of affordable, or even free, martial arts classes. Also, try some local churches and see if they or one of their members offers low cost or free training.

Just check google for a list of schools in ur area and call them.