An enterprising young chap around us letterbox dropped offering to mow the naturestrip for $10 - I think the whole street took him up on it and he has been back every 4 weeks. Is there anything like this that you could/would do? It worked as most people work in the area, was low investment and he didn't have to drive around from job to job. Also maybe dog walking/odd jobs/babysitting - there may be a hidden minefield of cash in hand stuff you could do. Is there anything like that you would be interested in??
Good luck!