Pricing is based on the number of messages you buy at a time.

Messages Price each
Total
  
10 16.5c
$1.65
50 15.4c
$7.70
100 14.3c
$14.30
500 13.2c
$66.00
1000 11c
$110.00

There is also a bonus 100 free messages after every 5000 purchased

All prices are in $AUD and are inclusive of GST.