I'm not sure if you've done this in the past, but would you mind explaining how to get clients in the "old - or new-fashioned ways without a marketplace site"?
http://swombat.com/2011/2/24/paulina-sygulska-how-to-network... is a great article on how to network.
http://swombat.com/2011/2/25/kevin-mcdonagh-how-to-attend-a-... also proposes an approach to get leads from conferences (and despite the apparent machine-gun methodology, I'd like to qualify this article by saying that Kevin is an incredibly chilled out, laid back, friendly kind of guy).
Blogging and community participation (HN, etc) is my best source of consulting leads next to personal recommendations (and it is often a friendcatcher which caught the person doing the recommending).
This is the key to freelancing in general, as my father always tells me.(freelance photographer in the Middle East for almost 40 years: http://gustavoferrari.com/).
Whether it's online or off, if you can convince your clients that you can get the job DONE, with no excuses or delays, they will come back again and again. They want to be able to send you work, and forget about it, confident that you will come through.
Then go after iOS and Android gigs. Currently demand is vastly greater than supply and both platforms are growing, so it's likely to be true for some time.