Cheapest price in NZ is $395 + delivery
https://pricespy.co.nz/product.php?q=ac86&p=4467565
AC2900 Dual Band Gigabit WiFi Gaming Router with MU-MIMO, AiMesh for mesh wifi system, AiProtection network security by Trend Micro, WTFast game accelerator and Adaptive QoS
Ultimate gaming experience - Built-in WTFast® game accelerator and Adaptive QoS deliver lag-free online gaming and smooth 4K UHD streaming
Ultrafast Wi-Fi - AC2900 W-Fi speeds boosted with NitroQAM™ and 5GHz quad-stream technology to handle even the busiest home networks with ease
Ultrawide Coverage – High-performance antennas, ASUS AiRadar and Range Boost eliminate dead spots, and MU-MIMO maximizes Multi-device performance
Ultrapowerful Processor – Enjoy smoother networking and faster data transfers with the PC-grade 1.8GHz 64bit dual-core processor
Commercial-grade Security – AiProtection, powered by Trend Micro™, blocks and neutralizes internet security threats for all your connected smart devices
AiMesh Supported - Connect your RT-AC86U to other compatible ASUS routers to create a powerful and flexible whole-home Wi-Fi network
Asus routers are brilliant. I run Merlin on my RT-AC5300, and it has all the features you'd ever want. A much better upgrade than any free router your ISP gives you. Hardware specs matter.
You probably need a travel adapter for the plug. Voltage should be compatible though.