The Antigama and Centaurus-A albums I bought 2nd hand of amazon were actually stupid not-for-resale promos! Totally my own fault as I failed to actually read their description properly, not thinking to wonder why they were so cheap.
Anyway, the Centaurus-A was just a thing you'd get sent by a record label, but the antigama was just a CDR in a cardboard slip with "antigama" written on it in marker pen. Haha, shameless.