Direct links to cheap versions of the books

for $13, the Grauer Book (Exploring)
http://www.amazon.com/gp/offer-listing/0136122329/ref=sr_1_1_up_1_spi_olp?s=books&ie=UTF8&qid=1359911531&sr=1-1&condition=used

For $0.01, the Computer Concepts
http://www.amazon.com/gp/offer-listing/1423906101/ref=dp_olp_used?ie=UTF8&condition=used