The best undergraduate introduction to differential equations I know-which would be wonderful for your course and you could probably get second hand cheap-is George Simmons' DIFFERENTIAL EQUATIONS WITH HISTORICAL NOTES AND APPLICATIONS.It's not too rigorous (although it's done carefully),has lots of applications and even better,it's one of the most beautifully written mathematics books ever published.It almost reads like a novel,with Simmon's wonderful humor and amazing knowledge of the history of the subject. It really makes the subject come alive and your class will love it. DON'T GET THE REVISION WITH STEVEN G.KRANTZ. Not only is it a lot more expensive,that book is a lot more formal and a lot of Simmons' personal touch that made the first one a classic is utterly missing here. Get either the first or the second edition of the original.
The Mathemagician
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