If you do a search for nitrous oxide looks like you can buy a box of 50 - 8 gram canisters for $25 each canister "sufficient to whip 1 pint (1/2 L) of liquid/cream"
Note: stuff comes out of canister at very cold temps sufficient to cause frost bite if directly in contact with skin.
Note: stuff comes out of canister at very cold temps sufficient to cause frost bite if directly in contact with skin.
2) The frostbite is only an issue with "crackers" which is why you need the balloons (which still won't prevent you from getting frostbite on your hand if you're not careful). You really want to use a soda/whip cream syphon. While the ISI brand are much more expensive, the mechanism is so much better it's worth the upcharge.