I hadn't realised that mturk requests could only be made in the US. I was planning on using it to save myself a little time in a side project I'm working on. A quick google search turns up ways around this though.
http://www.hit-builder.com/ offers a way around this problem for a $25 setup fee and 5% of use. I'm not familiar with mturk or this service but I suspect operating costs aren't that high. A barebones / follow on competitor could be a nice side project if you aren't concerned about amazon destroying your business model at some point in the future.
I was in the same position as you: I wanted to try mturk myself. That way I noticed that you have to be in the US. I did not investigate the matter further. Thanks for finding hit-builder!
Setting up a Mechanical Turk for non-US markets might work. (As of today you can work on mturk as a foreigner, but you can not commision tasks.)