If you don't have any luck with the other suggestions, you could try www.ozeparts.com.au ... they have a warehouse in Sydney, or they can deliver. Just go to the site and select your vehicle.
Their bumpers come unpainted, but they retail for $205 for genuine or $135 for non-genuine ... still heaps cheaper than the re-do you were quoted! Plus, if you register as a member, you get a further 10% off.
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Thanks for that buddha