i recently got a case of fuel for my butane stove from here:
http://www.kingbutane.com/

(i think i got a good deal on the stove because
the fule is hard to find..i went to a dozen stores
before i went on line to find it...

not many things in US are fueled with butane,
more common in methane, which is piped to houses,
(natural gas) and propane, which is aka LPG or
liquified petroleum gas....which is often used
in rural areas where trucks come and re-fill
pressuarized tanks, and smaller tanks can be
filled at gas stations or exchanged at other
stores.

butane i think is most common fuel in cigarette
lighters in US.