I am after Duet 3 and noticed this one is currently at a well acceptable price.
It displayed as 295.89NZD but you may need to pay extra due to GST rules.
As you state in your post, price on product page isn't the final price.
Last post for this product
I am seeing $289.59 including shipping and GST, which is a pretty sharp price with the keyboard
Local suppliers like JB hifi and NL have these for $398, so it's not a huge bargain. You'll probably pay aroind $315 from Amazon after credit card currency conversion charges.
Note there is a flaw with these. The keyboard eventually stops working - its just not well enough made to handle repeated opening and closing.
Cheers - had one for son #1, and needed a Chromebook for #2’s school this year too