Price dropped $48 overnight. Historic low price for this controller plus according to the listing it's the RZ06-02600300 model.
RZ06-02600300 is the 2019 hardware refresh and can be updated to the current 1.05 firmware.
The original Raiju Ultimates (RZ06-02600100) had widespread stick drift problems and can only be updated to 1.03.
JB-Hifi is currently selling the old RZ06-02600100 model on sale for $279.
This seems to be the only place to get the current RZ06-02600300 model from in AU (outside of Razer store for $349 but it's out of stock).
I bought the an Ultimate from JB last week and can confirm the old RZ06-02600100 model has problems. My right stick drifted and intermittently froze when aiming.
Contacted Razer about it, they gave me a statement saying the controller was a dud and I got a refund from JB within a few hours of purchase.
I'm telling you this on the off-chance you get a dud from Treasure PC you know you can return it (plus postage).