Where could I get my hands on Worthingtons Creamflow or John Smiths Extra Smooth?

I had worthingtons in spoons recently, and dont judge me but I actually really liked it. I hear John Smiths is pretty similar and I want to try it out. Does anyone know any pub or shop that could sell it? I know it's not big at all in Ireland, and I believe Mulligans on Poolbeg street used to do John Smiths so it definetly exists.