For various reasons it can be difficult to run a Mechanical Turk experiment (i.e., you don't have the technical expertise, you don't reside in the United States, etc.)
Have any third-party providers arisen with the express purpose of managing the delivery of psychological experiments using Mechanical Turk?
Update: Ideally, I'd like to know not just about how to get around the United States restriction. I'm also interested in services which manage the process and are specifically set up with behavioural science experiments in mind or at least offer a suite of services, one of which is tailored to behaviour science experiments.