I have, I want to say a 50, maybe an 80 bottle. It should last a hobbiest a long time. I think my regulator has a problem though because if I don't completely shut the valve after every use it will leak out. It's $26 to get re-filled here. Basically just a bottle exchange. I drop mine off and they give me one that's already filled. I think the first one was $75 filled. If it was not really convient to run down and get another I think I'd opt for a bigger bottle. Maybe 4ft tall. It's a drag when you run out and want to do a job.