The inscriptions of Campa ('Champa') are now available for free online as part of the Corpus of the Inscriptions of Campa project. This is good news indeed for southeast Asianists with limited budgets. Campa was an assortment of Indicised Austronesian-speaking kingdoms that existed in southern Vietnam in the first millennium CE. The Cham people had enemies to the north, in the form of Dai Viet (Annam/Annan), and to the west, in the form of Angkor. They were also responsible for the oldest discovered inscription in southeast Asia, the Vo Canh inscription. Their kingdoms were assimilated into Vietnam in the last millennium.
Cham Script (a later development; h/t wikipedia)