For membership and membership renewals, or to make a donation, why not spread the payment by dividing by 12 and asking your institution to make a periodic monthly payment?
Alternatively, you may stipulate a once-off payment with your financial institution.
To make a EFT donation now observe these details
A/c Name: Music Broadcasting Society of South Australia Inc
BSB : 105 900
Description: IMPORTANT. Indicate your name and purpose. e.g. J.Citizen-new mem’ship or Mrs H. Clinton-memb-renewal or W Churchill-donation.