I can confirm a few interesting things from this sale:
1. The conditions require a return, however you can get creative. You can do single open jaws or even double open jaws.
Single open jaw examples:
MEL-ADL, ADL-SYD ($99 + $99)
SYD-ADL-PLO, ADL-SYD ($169 + $99)
Double open jaw examples:
BNE-ADL-PLO, ADL-MEL ($169 + $99)
2. You can daisy chain multiple of these fares on a single ticket.
Example:
SYD-ADL-PLO, PLO-ADL-BNE, BNE-ADL, ADL-MEL ($169 + $169 + $99 + $99)
3. You can combine these fares with other non-SA-sale fares to make triangle trips etc. You can also combine other non-sale fares, eg. flexi Y fares or even J fares.
Example:
MEL-SYD, SYD-ADL-PLO, PLO-ADL-MEL ($109 + $169 + $169)
4. It's not just a SA sale...
You can use it to get to PER cheaper for example, and also visit SA whilst you're at it.
Example:
CBR-ADL, ADL-PER, PER-ADL, ADL-CBR ($99 + $99 + $99 + $99)
For comparison:
CBR-PER one way indirect via MEL/SYD is normally $369 one way.
CBR-PER non stop is normally $433 one way.
All of the above must be booked over the phone. Ask for the booking fee to be waived since you cannot book it online.
Not what I want to hear
I have some GV I need to burn. Might call and see if its possible to use them for these fares.
If they're from cancelled flights, why don't you take a refund?
I can confirm yes you can use purchased gift vouchers and also flight credits. You can even combine the two together.