Refilling Primus Blue Propane Cylinders

Does anyone know where I can get my new (empty) small blue Primus propane tank filled (about 10" in diameter). I remember in Saudi, we used to gravity feed them via a hose (10SR) from the larger household 20Lb tanks. I don't expect to do as much camping here, so could benefit from the odd fill up from someone else, or a station?
Thanks.
From what I was told, any of the gas suppliers can refill them.
There's even a guy goes door to door in Um Ghuwailina and bangs an old brake drum as a bell to get you to bring out your dead (cylinder)