Ask YC: I'm looking to outsource an iPhone app, where do I find companies?

At my company we develop our own iPhone applications, but we have an application that we don't want to devote our resources to and would like to outsource.

I don't have any experience outsourcing and am not sure where to go to find a company in India/China/etc...

Does anyone have any reputable and good outsource company that they have used in the past?