Craigslist is kind of trashy. Look in newspapers, go to strip malls and places around your neighborhood. You could also try making and selling things. My neighbor knits elaborate baby clothing and blankets and makes maybe $100 a week. It's not much but it could help.
I don't think there is one single best. I would start by using craigslist or in your case the Oregon employment agency.
good answer but im trying to find something that actually works.. ha craigslist sucks and the OEA doesnt really have anything... anyone have anything better?