Nikon on broadway might have them......
https://www.nikononbroadway.com.au/index.html
Japanese store Kyoei-Osaka are good , quick check looks a better price then Agena after conversion........
https://www.kyoei-osaka.jp/SHOP/nikon-nav-125hw.html
They accept international orders, just have to send them a email with what you are after and the Manager {Sakabe-San} will get back to you with confirmation and a Paypal invoice .