In mid-2008, Arizona suddenly jumped the cost of its State Land Permits from $15 per year to $50 per year, thinking they were going to make up a $600,000 deficit. I have a feeling it backfired, and they lost money. I know I didn't buy a $50 permit, and neither did my friends.
Well, good news! The cost is now back down to $15. For this $15, you can camp 14 days on Arizona state land, which is plentiful.
There are many beautiful places on State land, such as this one near the Foothills outside of Yuma, and the one at the top of the page at Florence Junction, outside of Apache Junction.
To find state lands, get an Arizona Delorme map and look for the purple land, or look at the online maps here.
To get a permit, go here and download the application. More information on the permit is here.