There are so many apart from the usual well known ones. These ones are great because people go "hhmm never heard of it, might have to have one of those parties!" lol
I am with Chocoholics Anonymous and love it.
Check their website for more info.
If you go to a website www.partyplan.com.au that is a website for party planners and there is a directory of loads of companies.
Just make sure you do full research before committing to any company. Do they need you to have an ABN, or register as a small business, how is the commission paid, what is the commission, what other expenses are there. do you have to pay for your catalogues and samples, host rewards etc..
Good luck with whatever you decide.