This is an excellent book. Easy to read, interesting problems, good humor, and a very solid foundation for quantum mechanics. Quantum will always be difficult and confusing, but this book does wonders to present interesting phenomena in more digestible bits.

Selling for $80 OBO.

Amazon link here: http://www.amazon.com/Introduction-Quantum-Mechanics-David-Griffiths/dp/0131118927/ref=sr_1_1?ie=UTF8&qid=1438555347&sr=8-1&keywords=introduction+to+quantum+mechanics+griffiths