I am the one who wrote the initial review and wanted to add a few additional thoughts for you:
First, I would deal directly with Nikki who handles wholesale inquiries:
Nisbets Australia Pty Ltd
Australia Head Office & Distribution Centre
Unit 2, 34-38 Anzac Avenue
Smeaton Grange NSW 2567
m: 0405 056 097
p: 1300 225 960
f: 02 4648 7801
If you're comfortable calling, I think that is normally the best way to express an interest. Otherwise, emailing them would be fine.
Then they will supply a distributor inquiry form for you to complete. On the form you will provide your business information and things like where you plan to sell their products, expected annual sales and so forth. If you're brand new to selling on eBay then you'll probably want to have a bit of a plan put together as to how you plan on building your business that way. If you're established then you can share the success you've already had and how you'd like to add their products as well.
Unless they've changed in the past several months, I think you'll find they're a good company to work with :)
Have fun, thanks for your questions and I wish you much success!