Not many choices

Of course, if you want to volunteer your time to not paid work, you're always welcome -- there are tons of volunteers out there, you can well be one of them.

Nevertheless, if you work for money, and if you are looking for ways of making extra money besides your low-pay job, stock and ebay may be your only two choices, as they both are free of schedule, and you can manage it so long as you have that ability.