How much does changing your gamertag in Australia cost?

Hi WonkyTesti, my name is Jhon, and will be a pleasure help you

If this is your first time changing your gamertag, you can change it once for free. This is true whether we created it automatically when you first signed up for Xbox (that is, if you didn't choose it) or if you created your own gamertag when you signed up.

Your first gamertag change is free, regardless of the number of changes you have made in the past, before the update. Subsequent changes will cost the same as before ($9.99).

source of information:

https://www.laps4.com/preguntas-y-respuestas/cuanto-vale-el-cambio-de-gamertag
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

I hope the information I gave you has been useful, have a happy day.

Here's how to change gamertags -
support.xbox.com/.../change-xbox-live-gamertag

It does cost 800 points to change your gamertag.

And how do I go about “paying” to change it? And how much is the cost... theres no way an admin can override this and change it back to my original gamertag?

How much was the card for? It costs $9.99 plus tax to change your gamertag. If the amount goes above what you have in credit it will need to make up the difference from another source.

Hello Biowar,

We understand that you're attempting to purchase an Xbox 360 Power Supply Unit (PSU).

Due to Microsoft no longer selling Xbox 360 products through our very own website, other 3rd party companies may sell these devices for various prices as those markets are now in control of what they will charge for this device.

It would be best to visit your local online market, and review the lowest listed prices for this device, as most are only sold online through websites such as Amazon and eBay.

We hope this information was helpful and wish you the best.