It's just Freon 134, available at any FLAPS. Probably cheaper that way, too. Just hold the can upside down when you open the charging tap to get liquid instead of gas. A CO2 fire extinguisher works better, if you have one handy.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!