Stats 116 / CS 109:
$80 - "First Course in Probability", 8th edition, by Sheldon Ross
(this is the newest edition, and it's in great shape!)
Math 52:
$20 - "Vector Calculus", 3rd edition, by Susan J. Colley
(current edition is 4th, but this has pretty much the same material! it's in good shape)
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