I just had 2 pork buns. I found a place that sells them at Central Station. The wooden steamers are directly at the door. They sell the buns right there.
$1.20 per bun. So damn good. SO DAMN GOOD!
This is how easy it is to get there from The Farm:
Click here
Note: You can actually walk through the tunnel and get out on the other side of George st. Google Maps doesnt have that information though. Hence the zig zag.
I have the feeling there might be regular trips for Farm Buns now.