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Titles doesn't show what the current textbook author/edition is being used; without that info, its hard to answer that question. Those are very basic courses, and any book covering the subject matter will do.
Math tends to focus on specific types of problems and in general you might need the actual current edition for things like practice problems and assignments.
For psych, you can buy the ebook online, and its pretty hard to aquire a free version of it because I believe the course instructor wrote the book himself; psych coursewear is custom paper printouts, which isn't available for free, but you could always buy and copy to split the cost with a friend.
Biology has used "BIOLOGICAL SCIENCE by Freeman" for the longest time, but there was a switch to a textbook co-written by a professor. The Freeman text was sold by the dozens at a discount booksale last year for less than 5$, I'm sure you could find it for cheap somewhere.
Same for chem, General Chemistry by Petrucci. Try searching on a torrent site... or DC++ if you're in residence.
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