Balaam, DN, M Veseth, and University of Puget Sound. Faculty of the International Political Economy Program. 1996. Introduction to international political economy. Prentice Hall Upper Saddle River, NJ.
Undergrad text that introduces IPE. Very standard: realism, liberalism, marxism, and they throw in rational choice for good measure.
"In simple terms, we define IPE as the study of a fundamental tension between and dynamic interaction of two spheres of life, which we can variously call 'society and individuals,' 'politics and economics.' or 'states and markets,' Any way you say it, political economy is about the lines that both connect and divide national interests from individual self-interest" (3).