Since a lot of iOS owners are also Mac owners, and ALL iOS developers need to run Mac OS X, you might want to check out the bundle at BundleHunt.com. There are icons and vector graphics that should be useful for developing apps and websites, but I'm particularly interested in the BannerZest program that lets you create snazzy banner ads. They claim the bundle is worth $1100, and while you might not need everything in the bundle, the odds are you'll want a few, and for $50, the price is right.
Bundling is a neat concept and has been successful for Mac programs in the past. It's a win-win as users get a great deal and developers reach more users than they might otherwise. It would be interesting if Apple had a similar mechanism for the iOS and Mac App Stores, but I won't hold my breath!
Note that BundleHunt.com even has an affiliate program that lets you earn $5 for each person who buys the deal using a custom link you can share. Don't worry, I am NOT an affiliate. The only link I'm sharing is http://BundleHunt.com. But you might want to try it so I just wanted to let you know about the opportunity.