Since cancelling my subscription following the trial here, I received the above coupon code for 50% off first order, which seems to be generic.
Starting from $12 ($24 x 50% off) for 500g of the Porter St coffee delivered. Coffee is very good quality. You can set the subscription to four weeks and cancel after you receive your first order.
Make sure to enter CHRISTMAS50 into the discount code field at checkout.
The email suggests "it's only valid until the reindeers take off" so you should order before Christmas Day, but since that's only a few days away, don't expect it to arrive until the new year! Coffee is roasted fresh to order.
T&Cs from the bottom of the email: