• Release Announcement: http://www.yuiblog.com/blog/2013/01/23/yui-3-8-1-released/
• Seed: http://yui.yahooapis.com/3.8.1/build/yui/yui-min.js
• Zip: http://yui.zenfs.com/releases/yui3/yui_3.8.1.zip
• GitHub: git checkout v3.8.1

Release Build (download this for local deployments)