[pct-l] fuel canister by USPS?

[anna mathys]

hi gang.
Anyone has updated information about sending butane cartiges/fuel
canister/compressed gas for cooking (sorry, don't know the correct
expression) with USPS or UPS? Conditions, prices? I went to the post office
and they told me it's impossible since 9/11, but I have also a sheet from
2004 which sais it's possible to send cartriges, if you lable the parcel
correctly. help!
AnnA