The iphonedevcamp.org is at the end of July and is only $50. It’s mostly developer centered, but it’s a great way to learn to become an iphone developer. Here are some quick steps you can take to be able to write iphone apps in less than 31 days, for less than $100, and less than 60 hours of effort. The only requirement is that you have a mac.
1) Buy the following book: http://www.amazon.com/iPhone-Action-Introduction-Web-Development/dp/193398886X ($26) and go through the exercises in chapters 10-19 ( 30 hrs)
2) Sign up at iphonedevcamp.org ($50), (includes tons of food and beer for an entire weekend)
3) Attend dev camp and develop your own app (24 hrs)