Depending on how much soda you want to carbonate at one time, you might
consider getting a seltzer bottle. They are powered by the little CO2
cartridges.
You just fill the bottle with the liquid, put on the top, attach the
charger with a cylinder in it, shake the bottle to insure the CO2 gets
absorbed, and bingo, you have carbonated whatever. Plus it is ready to
dispense into your glass without any further mess.
(Also makes a great waterfight weapon.)

Grant Erwin wrote:

Is there *any* way to avoid paying $75 for a 5 pound CO2 bottle?
My daughter wants to learn to carbonate her own soda, and I might
need it for MIG after she is done with that.

Just looking to save a buck ..

Grant Erwin
Kirkland, Washington