Show up to PHP meetups in your area if you're near a largish metro. Go for beers afterward, meet the people, mention what you are doing. Keep doing this and wait and you'll likely start getting work coming your way that has a completely different category of client than you'd see on some sort of marketplace.
Meetups depend largely on geographic location. If you are already in a large city this is good advice. If you are anywhere with a population of sub 500k then people looking for help is few and far between. Also for every one that does show up and has money to pay ten show up saying how they have a "great idea" but no money or skills and why won't anybody work for 2% equity?
