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The Student Writer's Essential Shelf
By an Amazon.com customer
The Elements of Style (4th Edition)The Elements of Style (4th Edition) by William Strunk
Buy new: $10.85 / Used from: $6.50
Considered the classic, the standby, THE style manual.
On Writing Well, 30th Anniversary Edition: The Classic Guide to Writing NonfictionOn Writing Well, 30th Anniversary Edition: The Classic Guide to Writing Nonfiction by William Zinsser
Buy new: $10.19 / Used from: $4.50
On the Art of Writing: Lectures delivered in the University of CambridgeOn the Art of Writing: Lectures delivered in the University of Cambridge by Arthur Thomas Quiller-Couch
Buy new: $14.99 / Used from: $17.33
Much more reasonably priced than the original text.
Writing Tools: 50 Essential Strategies for Every WriterWriting Tools: 50 Essential Strategies for Every Writer by Roy Peter Clark
Buy new: $9.09 / Used from: $6.84
Sin and Syntax: How to Craft Wickedly Effective ProseSin and Syntax: How to Craft Wickedly Effective Prose by Constance Hale
Buy new: $10.17 / Used from: $5.35
Hilarious!
The Little Red Writing BookThe Little Red Writing Book by Brandon Royal
Buy new: $9.99 / Used from: $0.99
Useful for everyday writing situations
Writing Down the Bones: Freeing the Writer WithinWriting Down the Bones: Freeing the Writer Within by Natalie Goldberg
Buy new: $10.08 / Used from: $5.82
Discusses writing as a practice (journaling, in other words).
Blair Handbook, The (with MyCompLab NEW with E-Book Student Access Code Card) (5th Edition)Blair Handbook, The (with MyCompLab NEW with E-Book Student Access Code Card) (5th Edition) by Toby Fulwiler
Buy new: $55.48 / Used from: $50.20
Rhetoric classes require students to have handbooks like this one. However, it's useful to collect a few different ones for their writing advice (older editions work for this purpose and are much cheaper).