You don't need a lot of money to lose weight! In fact, eating healthy fresh fruit, vegetables, beans, and low fat milk is a lot cheaper than eating out and getting processed food or meat at the grocery store (in most cases).
I am a grad student, so I can't afford a gym membership, weight watchers, or the like. There are free support groups in many communities (overeaters anonymous is one) and also websites like this with free support. For exercise a quick walk around the block (give yourself time to build up strength) can be a start. The internet is full of websites and videos of at home do-it-yourself ways to work out. Jumping jacks, sit-ups, push-ups, and others don't require fancy machines or a gym- they all burn the same calories!
Finally, be good to yourself. Weight loss shouldn't be a punishment, it should be a loving, caring plan that you deserve because you are an awesome person! Everyone is given obstacles and burdens in their lives, and we here have been given excess weight! You aren't weak or broken- you are loved, and we are all here for you and you are here for us. Together we can all help each other with this burden.