skelooth
DuckfaceNinja
I use Odesk.com and it has been great. Very reasonable prices and you don't have to pay until the job is finished if you don't want. It's all about finding the right person anywhere. I hired 3 different people for similar jobs and have just stuck to one person because he was way better and easier to work with.
The difficulty I have had is making sure they are English speaking as first language preferably. So you can weed out who you don't want. There are a lot of talented people on that website who do it for fun as well as a living. I found someone in the UK who does incredible work for 1/4th the price of someone else I could find doing the same caliber of work.
He has been doing all my art and animation for great prices and is willing to make any changes quickly.