I will next teach this class in the Winter 2019 semester. It will be heavily revised from the last iteration.
Here are the Amazon links for the textbooks that we will be using:
Romer’s Advanced Macroeconomics. You should be able to get a used copy for about $20.
Gali’s New Keynesian text This will probably cost closer to $40.
Farmer’s Macroeconomics of Self-Fulfilling Prophecies This will probably cost closer to $40.