We regret we have not choice but to increase the prices as the increase from Australia Post is too big for us to absorb. 

Australia Post New Pricing from  3/4/2024

Price increase is as follows;

Registered Post +4.1%
Domestic letter with tracking +24.7%
Prepaid envelopes +25.0%

The following is the announcement from Australia post:

Following my email in September last year, I can confirm that Australia Post intends to proceed with the proposed price increase to reserved ordinary letters, which includes a 30-cent increase to the Basic Postage Rate (BPR), up from $1.20 to $1.50. These changes are due to take effect on 3 April 2024.

There is an Increase to business letter service pricing 

There are also changes to the pricing of business letter services which, subject to finalising regulatory processes, will take effect on 3 April 2024.
We look forward to continuing to work together to support your business into the future.

Yours sincerely,
Gary Starr
Executive General Manager
Parcel, Post & eCommerce Services