Telstra has recently reduced all their pricing for both home and business internet. If your with Telstra you should check what you're paying and see if you can pay less (and possibly get more data while you're at it).
50GB business ADSL is now $60 see the details at the link below:
For home services (Note that I don’t necessarily recommend bigpond home internet as there are some significant limitations you may want to be aware of with this service) it looks like they have reduced the prices as well. In addition they have introduced some high volume plans while I wasn't looking.
(Domestic only plans)