I have 2 kaplan mcat review sets, both barely written in, no highlighting. I found them to be a very good resource for studying for the MCAT.

Kaplan 5-book set - $90 (the blue set)
Kaplan 6-book set - $100 (the grey set) - this set includes a lesson book to go with the Kaplan test course.

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other books - some of these are an edition behind what is in use in the class, but I seriously had no problem as very little material changed between editions.

Berg - Biochemistry 6th ed - for Chem 181 - $65
Barr - Introduction to US Health Policy - Humbio 120 - $35
Pavia - Introduction to Spectroscopy - Chem 130 - $40
Kandel - Principles of Neural science - for Psych 120, Bio 153, Bio 165, and Bio 222 - $30
Guyton and Hall - Textbook of Medical Physiology 11th ed - for Bio 112, Bio 212, Humbio 133 - $25
Atkins - Physical Chemistry 8th ed WITH ANSWER KEY - for Chem 171 - $30
Oxtoby - Chemistry 4th ed - $10

all prices OBO, willing to negotiate if you buy more than one thing