Here we go, I found a social media post advertising them a couple of months ago. I thought they were sold by the tray but it appears they are $2.75 each... which gets very pricey very quick... but they are also filled with pulled brisket....
Thanks to you, I am now going to have to go and visit this butcher... Thankfully I live in Warnbro, so my car is already armoured and the used needle jabs no longer effect me.