I am relatively new to mobile apps - my first free Android app has been released to Android Market just a few weeks ago and is doing quite well. I am also coding iPhone version of the same app right now.
I think you would be better off hiring some developers from India / China using freelancing sites like Freelancer or Odesk.
The rates I have seen quoted by Indian iPhone developers at Freelancer were in the range of $12-$20 / hr, but this is what they post on their portfolio pages. When they actually bid on your project, it is quite often a fixed price bid, and their rates would usually be smaller than that.
Of course, EVERYTHING depends on the project complexity. Really simple app could be done for $250, average app could probably be coded for $1000 - $3000, and $10,000++ app projects are there too...
Also, just a good quality app launcher icon may cost you $50-$80 if you decide to hire a pro graphic artist. I paid $80 for my icon and I really liked the results (it could also be seen on a website in my profile). Before hiring a designer, I have drawn a bunch of drafts by hand, and then posted it as part of my project specs. I think getting good icon is very important - it should catch user's attention while they are browsing the APP STORE or Android Market. Also, I am using mine as a Twitter avatar and it does help to attract more users.
Good luck with your app ideas,
P.S. Oh I just realized that you are NOT looking to develop the app, but rather going to offer your development services... Well you should probably know the rates then