I have seen some interesting developers on Guru.com and Elance.com. Be sure to be super specific in what you want though. Maybe get a designer to mock everything up before hand. And look for developers that have done something similar before.

Price is going to depend on how complex your app is. For a simple content play, I would expect

Also, I saw this response on a forum recently:

One of my companies (http://appstorehq.com) offers a public directory of all iPhone app developers, including 236 (at last count) that develop apps for hire (http://www.appstorehq.com/developers/search?crumb[accepts_contracts]=true&crumb_order=query%2Caccepts_contracts ). You can also narrow this list by app category, the number of apps they have in the App Store, and the average rating of their apps.

If digging through all these is too daunting, we also offer a developer matching service and would be happy to help find you a match. To head that route, just go here: http://www.appstorehq.com/find_developer

There are lots of sites online that you can use to post a job and get bids. getafreelancer.com and odesk.com are some additional site I'd recommend. However, I believe that it's always best to find a partner through personal references rather than these sites because you never know what quality of work you're going to get and what business ethics the company or individual will bring to the table. Regarding rates you can get shops as cheap as $5 an hour and as high as $50 an hour. Good companies in South Asia tend to operate in the $20-$30 / hour range. This is similar to the rate you'll get in Easter Europe, Russia and China (the rates in South Asia are closer to the $20 range). The important thing besides the company's hourly rate is their experience, and expertise and their workforce's ability to communicate clearly in English over email and IM. Apart from this you should think about what specifically do you want built? Is it games, enterprise applications or something else? For any consumer-focused application development you'll need a shop that gets user-experience and user-interface design and who are sticklers for high-quality work. For enterprise work you're going to need someone who has server development experience and understands security, networking and databases.

In the interest of full disclosure, I run a game studio and we do self-publishing, work-for-hire and porting. Feel free to get in touch if you like. You can learn more about us at http://tintash.com/about

Good suggestions above, especially if you are managing a big pipeline of projects.

If you are looking to get started on a few smaller apps, you may want to consider going to an iPhone developer meetup and making an announcement that you have some contract work available. In the Bay Area there is a great group called Silicon Valley iPhone Developers' meetup (http://www.meetup.com/sviphone/) where you'll find hordes of capable developers that are looking for short contract gigs.

These will generally be more expensive developers than those you'll find in the overseas shops ($70/hr+), but they can also be more convenient and accessible in many cases. You'll have to do some more of the project mgmt and keep on top of the developers (versus a shop may handle that function for you). But you get the advantage of much more hands-on control, and in many cases some very high-quality output.

For sure http://GetAppsDone.com. It's simple and they don't try to keep control of the relationship between you and the developer.