What are some sites that are similar marketplaces for graphic design, like 99 designs?
There are a few, but not as good as 99designs though 
Totally agree with you. Design99 is one of the best around.
agree… until now… i haven’t win anything from there… hard competition!
Thanks for posting them!!!
Well, if you are looking for a cheaper option there is always Digitalpoint Contest section. I must admit however I do like the quality of the 99designs designs a lot more though.