We've been approached by two different companies who offer these types of services. Both of them have programmers in Ukraine, which is not doing very well at the moment, as you might know.
As an example, there's one popular AR app called Layar, which in turn is our current AR engine. Well, Layar is an start-up from the Netherlands, but some of the programming of it happens in Ukraine. A similar history happened with Skype. The business (idea) leads were from Denmark and Sweden, but the coding happened in Estonia, still is today! Even after Microsoft bought it.
In our case, sometimes it have been difficult to find developers (for many reasons), we haven't used the services offered by these outsourcing companies, thus we can't say weather they're good or not. I can say the prices they offered were very competitive, almost half for a senior programmer, or so they say is senior :-P
Check them out, Daxx
is located in the Netherlands, and Ciklum
is located in London. Both have their assembly lines
If you wish, you can contact me directly and I can redirect you.