This article is from the Anime Resources FAQ, by Steve Pearl with numerous contributions by others.
The only OFFICIAL (i.e., legal) source for anime scripts in the US is A-Ni-Me: The Berkeley Journal of Japanese Animation. The first two volumes are available for $15.00 from Nikaku Animart and Books Nippan. Volume 1 contents:
Editors' Note
Anime Survival Guide
Jerry Beck Interview
Bubble Gum Crisis 1-6 Synopsis
Bubble Gum Crisis Song Translations
Dragon's Heaven Script
Gunbuster 1-6 Synopsis
Megazone 23 Pt. 1 Script
Megazone 23 Pt. 2 Synopsis
Megazone 23 Song Translations
Nadia 1-3 Scripts
Nadia Song Translations
Outlanders Script
Rumiko Takahasi Introduction
Ranma 1-10 Scripts
Ranma 11-18 & Nettohen 1-20 Synopsis
Volume 2 contents:
Nadia Introduction
Nadia 4-6 Scripts
Nadia 7-39 Synopses
Ranma 11-13 Scripts
Ranma Nettohen 7-9 Scripts
 
Continue to: