Welcome to TalkMagic!
Not sure where in Iowa you live, but if you're anywhere near Omaha/Council Bluffs most Barnes and Nobles in the area have a decent selection of Magic books (including Bobo and Mark Wilson's books both mentioned in this thread).
I don't know of any Magic shops in Iowa (though I'd be interested if you know any) but there is one in Omaha and one in Lincoln.
In Omaha stop by
Mangelsons. In the back they have a year-round Halloween section and the front-most desk in that area (toward the Farmhouse Cafe) is devoted to magic. They have recently redone their selection and seem to have some decent supplies.
In Lincoln stop by the
Magickits.com Magic Shop. They're pretty friendly and willing to work with you to find something that will fit you. If you get the chance to talk to Luis, the owner, he might even show you his secret area with his private collection of magic books and magazines from the last 20+ years, including a mint copy of Ricky Jay's Cards As Weapons.
Good luck!