The price of the letter depends on the number of pages. It is broken down as follows (all pricing excluding GST:

Australian Letters


No. of Page/s
1
2345
Single side letter,
into DLX envelope
$1.30$1.45$1.61$1.77$1.93
Double-sided letter, into DLX envelope$1.39$1.65$1.91$2.17$2.43