Just buy the cartridges off amazon or something haha.
honestly unless you're willing to spend 3.50/can or however much aerosol whip cream costs in your region, just wait until you can find cartridges or a tank. It's there if you look for it!
And for harm reduction sake; as mentioned above, don't tilt it upside down when you inhale, in order to prevent choking to death on whip cream.