It cost me $44 inc postage. It took 4 days to come, they ship from QLD.
They usually supply a vanilla cake, but I asked for Chocolate and they had no problem changing it over - no charge.
They also include a template for any fondant or cake shape you need to cut out, so you really can't go wrong - I think - I hope!
I believe the ingredients have a 5 week shelf life so that's how much in advance you can get it.
You just need to buy milk, eggs and butter.