ah... you're in australia, right?

not sure about over there, but in the us some headshops will have them. In fact, I bought some at a real small quickstop type convenience store one time (a box of 24 chargers for like $10). and specialty food stores sometimes have them. and, of course, there is always online;).

example of a few stores?

hmmm

idk if australia would have the same stores as the us..

but like a gourmet food store, or if you go into the 'headshop' area of town where there's always users / the like then more stores will have them...

like when the convenience stores always have pipes / bongs, then, at least where I was at, they had nitrous too:).

between a half and a full 1/8th each. Depending on how hard you want to trip.

i would bring an ounce. i would also bring nugz, cigarettes, nitrous, an a few xanax just incase