to answer your question - you would only be able to get it filled if it was attached to a gun, and they aint gonna get a new out of a box and start doing this.
So you have to get it filled on your gun
Anyway it only takes 30 Seconds to fill one so you only really need one cylinder
you would be better better of getting a surface bottle and refilling the cylinder yourself.
But none of this is FX dreamlike specific - it would apply to any PCP
Does this help?
BTW the DL's are fantastic, probably one of the most simple, reliable and high quality airgun.