javax.el is a part of JavaEE 5. So, Java EE 5 SDK is a right place where you can get it. However, do not be so optimistic. Taking this package will force you to take the rest. If you do not want to install Java EE SDK , but want to use JSF 1.2, only one way to go is using facelets.
If you have existing working application and want to migrate it to JSF1.2+Facelets, it might be a challenge. I mean replacing jsp with xhtml.
Working template for JSF1.2+Facelets: http://blog.exadel.com/?p=23