Hi Phil,
This supplier is based in USA but can send internationally. It has the CTEK battery chargers - Link hidden: Login to view
Suppliers are in constant competition with each other and seldom will you see the wholesale pricing published on their sites. You may need to get in touch with them directly and / or register as a dealer in order to be provided with wholesale pricing. Most suppliers will also often tailor their prices to your order (the more units you order, the better discounts). There are also suppliers who will negotiate better prices with sellers that they have a good relationship with.
Hope this helps. :) I will try to search further for Australia based suppliers that you can use, and will update this post.
Have a great day!