Fares do vary. Usually around $300 one-way for QF though sales do come and go. The lowest I've seen it lately was $199. $248 is a good price, though October is not a peak travel time so my bet is that another sale will come along. Though at most the fare would be the same price - or $10-40 cheaper in any future sale.
If booking the WLG-MEL return do it separately from the MEL-WLG, unless starting from NZ. Fares are cheaper than the same Australia based fare and no CC charge.
QF sales are around every second week, so next week I assume.
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