Hey Gotowo
I have 4 kids riding and unfortunately they are all about the same size so very little gets handed down. I am always looking for a bargain so I recommend that you have a good look on Ebay US. Go to motors, accessories and then apparel and search boots, enter your postcode and country and then search by postage and shipping highest first and run through the list. Guaranteed Tech 10’s will be up at the top of the list. Great thing is that price plus postage will be shown, postage indicates that the seller is willing to post to Australia. There will be significant variance in the price of postage so be cautious. Most of the prices are buy it now so the price will be know.
There are lots of sort options, trial them out.
I find it a whole lot better than sifting through various international websites. This way you get a list of many suppliers on one site. Most of the suppliers end up being motor bike shops in the states clearing superceded stock. Often it will be close out models so be sure you are pricing what you actual want. I am usually happy to hahave the boots and dont really care if they are the 09 colours or the 10 colours.
Remember that it can be very expensive to return the item if it doesn’t suit and this is the big advantage of supporting your local shop. Also consider whether you can get parts etc when they break.
Good luck with the hunt and if you need more help pm your phone number.
Unit