Go down to the local flying clubs and ask if they need anyone to wash their aircraft, or even just the windows/windscreens.
Thats the way I used to fund my PPL.
I would advise probably going down there in person, and not emailing/ringing. You won't get a lot but I used to get perhaps an hours free instruction a month doing it, as well as cash.
Got plenty of time going along taking the aircraft to check's, fuelling up etc too. Great way of experiencing flying club life.
Best of luck!