I looked up OTEN last night for business admin and found it said the following under the fee details for the specific course. So that might take that out of the options for you?
Due to a policy change on 1 July 2013 enrolling students must have a NSW residential address or be employed within NSW to be eligible to access government subsidised training places in TAFE NSW. For full details of this new policy click here.
I also found Government of WA, Department of Training and Workforce Development
which half way down lists a 'course search' which when you type in business admin brings up all your options through TAFE WA of those a couple seem to offer external study and possibilities of reduced fees. You have to do some clicking through to find the info you want though.

HTH and good luck!