Few cruises leave from Adelaide…
And - if you book a place on a ship passing thru Adelaide - you're likely to be paying for the place from the port the ship began its journey (before landing on in Adelaide).
Very unfair, & unique to cruise ships, I think.
If you are traveling alone - & can't book a "cabin for one" - you're likely to be paying for all (typically, 2 or 4) beds of a multi-person cabin.
Also unfair, & unique to cruise ships, I think.
So, How to Cruise without a Bruise on a single's budget?
Well, travelers often arrange shared transportation (ride-shares, etc.) at, eg, YHA, Festivals, etc.
So, why can't folks arrange cabin-shares to save $$ on cruising?
Are there any web sites, where people can contact others to arrange a cabin-cruise?
(Can it be done, here on OzB"?)
P&O is descirbed as a "budget" cruise company by a local travel agent.
(My auto-club recently had a deal on an Adelaide to Fremantle cruise on a P&O
ship, so they may be OK… or…?)