compact subwoofer available for a good price of $219.85 via Big W marketplace
I was able to get a price beat via webchat at a local SuperCheapAuto for $218.85, and have access to 7% SCA gift cards (https://www.ozbargain.com.au/wiki/discounted_egift_cards) so it brought it down to $203.53 with local pickup.
SCA initially didn't want to price match because it is a 'Marketplace' but their Price Beat page makes no mention of this, so eventually changed their mind.
50W RMS?!
That's a speaker, not a subwoofer lol