The best place to find one is via your network, if you do not have someone in your network that you know personally then your networks network is the best place, find someone who knows someone at that point in my experience if you have to go to a 3rd degree then it is a wash and you can probably do just as well to hire some random Joe. As for pricing, iPhone is a hot commodity expect to pay above $100 an hour for a truly experienced iPhone dev, you can take you chances with a college kid or off-shoring but to me it sounds like you need a dev that can get you from A to B you need a dev that is going to be in the > $100 range (most are $150+).
A few tips I gan give you, is no matter how crappy, draw a picture of every screen, the developer may totally change the way the screens look but this will at least give them an idea of "what" you are trying to build. Also every item on the screen explain what it does and what should happen if it does not do it. If you have that level of detail, then you can get a pretty detailed estimate on what it will take to build. If you want to contact me, my email is in my profile. I am way to busy to take any more work but I can help you head in the right direction.