Jen presented me with a 20L stock pot in which I concocted my first double-batch of beer.  For 50L of beer, I used 6kg of light dry malt, 150g crystal grain, 100g chocolate grain, 130g Fuggles hops and S-04 Safale yeast.  Cost-wise, that's $42 + $1.50 + $0.65 + $6.80 + $3.75 + $2 postage = $56.70.  This equates to a cost of about $11 per case of beer.
Most of the components of this brew were acquired from Jayne Lynn from BettABrew Beer & Wine Making Supplies in Parkwood, Queensland.  Jayne offered me a better deal on the postage if I purchased materials in bulk.  As such, I placed a joint order on behalf of Phil, Mix, Jen and I.  Here's what we received:
$280.00 : 2 x 20 kg light dry malt extract
 $26.00 : 1 x 500 g cascade hop plugs
 $23.50 : 1 x 450 g fuggles hop plugs
 $59.00 : 1 x HDPE 60 litre fermenter, bung and airlock
 $11.85 : 3 x Saflager S23 yeast
 $11.25 : 3 x Safale S-04 yeast
  $7.90 : 2 x Saflager W-34/70 yeast
 $15.00 : postage
-------
$434.50 : total
-------
I recall now that I will need an adhesive thermometer and another tap but Big W will likely satisfy these requirements.