The online Apple Store is no longer selling iChat AV for Mac OS X 10.2 (Jaguar).
iChat AV, Apple's videoconferencing software designed for use with the iSight video camera, is part of Mac OS X 10.3 (Panther) and was previously available for Jaguar (10.2.5 or later) for $29.95 in the online Apple Store.
Apple's iChat AV page no longer mentions the use of the software under Jaguar and the iChat AV download page states that "Mac OS X v10.3 or later" is the minimum requirement for iChat AV 2.1.
The iSight and iChat AV (as beta software) were introduced in June 2003.