Ask HN: Outsourcing mobile app development, how and how much?

Suppose I had some ideas for a few simple mobile games, for example a card game and/or simple 2D scroller, a budget of about $5000, and I only have enough time in my schedule to source developers, sketch concepts, approve the work, and source media.

Do I have realistic chance of creating a simple mobile game for iOS (and possibly Android) with these constraints? If not then what am I missing?

For those who have done this, which outsourcing forums do you recommend for this type of work?