Greenbarn potters supply in Port Kells might be a good place to look. That is where I picked up my fire brick a few years back.
You said you played around with a coal forge for a while, could I ask where you got your coal? I'm out in the valley and am having a hard time sourcing any coal. I'm also just starting out so I don't really have any contacts in the community with makes it a bit more challenging as well.