I have 2 hats - I am both a service provider and I create products to sell. But at present I am not wholesaling due to the high costs in creating the products.
There is the Australian Gift & Homewares Assoc and I recommend attending the next trade fair for research. Everyone appears to use Eftpos/Credit card machines for orders.
Also, if you are selling at wholesale, you need to look at what the retailer marks up. For example: say the retailer wants to buy at 60% of what they sell for. Then when they discount at sales, they will still make some money. You have to work out if that's an amount you are still able to make a profit at. All orders should be paid for before delivery. Sometimes it's not worth selling wholesale for some products. This too needs consideration.
Have a look at
http://www.homeandgiving.com/
Next dates for trade fairs are
4-7 July 2009 - Sydney
1-5 August 2009 - Melbourne
27 Feb - 2 Mar 2010 - Sydney
and the association home page
http://www.agha.com.au/
You could also phone the association and chat to them about your dilemma.
Good luck.
PS there is a thread somewhere about credit card costs etc.
I personally use the Commonwealth Bank merchant service as their rates are good for me. But there's a lot to investigate. I also use PayPal for overseas purchases and sales.