Does anyone know a site or organization which offers cash to lose weight(I don't mind using their products)?

I'm a plus sized women and i want to lose weight but i want to do it for an incentive. I wouldn't using their product/s during the process. Or do you know how i would go about contacting companies such as slimfast, mcdonald's, jenny craig, bally's, etc. to be compensated for losing weight while promoting?