Here is a full-service (hiring, project management and testing) site that provides mobile app development - all service is web-ba<x>sed: www.taskcity.com
You may post the project on the site to get their web-based suppliers to put in a bid so you have an idea of the pricing and candidate profiles. The rest would be handled by a project manager. In case you need to have many apps (say 100) to complete within a short time, this would be a good place to check out as well.
