Those tall butane canisters are very widely available, just from a different set of sources. They are pretty cheap and if you are willing to buy a case from a wholesale kitchen supply store you can probably find then for under $2 a piece for 8 ounce ones. Single ones can be found for $3 pretty widely. If I were to stick with gas stoves I might consider switching to these at least for some trips in warmish weather. It is about twice as much fuel as I'd usually carry when solo and using iso-butane

There are also adaptors for stoves with remote iso-butane tanks.