Where can i find the tribe books?

[Annabelle]

There was this show called the tribe, where all the adults were wiped out be a virus.
There were two books that came out.
The Mallrats
and
Power and Chaos
does anyone know where i can find these books in Sydney, Australia
Thanks
p.s. I despretly need them, ive been looking for ages especially the one called the mallrats!!!