Most students will probably wish to choose one of the
following three options:

The Cheapest Option with the Serway Text
Electronic Text with WebAssign <== Cheapest if purchased online from your WebAssign account

The Cheapest Hardcopy Option - all the text except the HW problems
Hybrid Text with Enhanced WebAssign

The Full Hardcopy Text and Problems - Volume 1 only
(only for students who want access to all the authors' HW problems -
 you still must buy Enhanced WebAssign access)
Volume 1 of Full Text