Twentieth Century Words by John Ayto for under $10 on amazon.

From Library Journal

Based on The Oxford English Dictionary and its supplements, entries include the date of the word’s earliest appearance in the OED, a definition, and examples of usage. Words are arranged by decade, which is fine in theory but problematic in practice: had Ayto traced linguistic developments thematically, this volume would have been much easier to navigate. As it is, readers will have to rely heavily on the index…. brief essays that introduce each decade, situating new words in their historical context… this book encapsulates 20th-century developments and will appeal to scholars and readers.