The paperback is available on Amazon here, and the pdf is available on the Bacchae page on this website.
This commentary is 7 x 10 inches (17.78 x 25.4 cm), slightly larger than the common 6 x 9 in. commentary in order to accommodate more vocabulary and grammatical notes with a larger and more readable font.
Greek and Latin Texts with Facing Vocabulary and Commentary 
Thank you for helping out aging eyes with larger print.