On the order I received by mail, the amount for the Dekunu one is in AU$.
On my profile, I use Euro as default currency, chosen when I placed my order.
Last week I noticed that the price on my order of the device (viewed online on my profile), was suddenly 526,36€ instead of 366€ (in the shop). Also the prices of the other items (extra mounts) are more expensive on my order than in the shop (44€ instead of 31€), etc.
On the order I received via mail, in AU$, there is again another amount for the device.
I noticed when I change the currency, the sign changes (€ -> AUD,…) but the amounts stays the same. I guess the currency on the order on our online profile is always shown in USD.