Scoutzie is a curated marketplace of mobile app designers.
The community vets all potential designers, either through a formal portfolio review or through a members-only invite process. This review process has resulted in 500 top notch members of the Scoutzie community and around 1,500 applicants who didn’t make the cut.
Surprisingly you can start a project with a budget of less than $500. I'm not sure who'd be interested in this among their list of highly qualified designers.