As for now I'm looking at three books:
http://www.amazon.com/Barrons-AP-Microeconomics-Macroeconomics-4th/dp/0764147005/ref=sr_1_3?s=books&ie=UTF8&qid=1348421498&sr=1-3&keywords=ap+macroeconomics
http://www.amazon.com/Macroeconomics-Crash-Course-Advanced-Placement/dp/0738609714/ref=sr_1_2?s=books&ie=UTF8&qid=1348421498&sr=1-2&keywords=ap+macroeconomics
http://www.amazon.com/Microeconomics-Macroeconomics-2012-2013-Placement-Examinations/dp/007175122X/ref=sr_1_1?s=books&ie=UTF8&qid=1348421498&sr=1-1&keywords=ap+macroeconomics
Thinking about just buying both of the last two since they both have good reviews.