Yep Greenlandmx and Motocrosscenter are a godsend for NZ - make sure you ask for a custom shipping quote from Mcc, the default basket shipping cost is insane.
I've previously had good shipping price from
https://trialendurodirect.com/ but haven't used for a while.
UK shops often use Royal Mail which is super cheap compared to Fedex/DHL etc. and with the colapse of the pound can be the cheapest country to order from.