Not sure what to do anymore

[Joshyboy]

Rat pups are 1.50 and small rats are 2.00. I think weaned rats are 1.80. You get a better deal if you buy in bulk. I don't know about mice. I never bought any from him.

How many do you usually buy at a time? (sorry for all the questions) and how do you use the dry ice for the euthanasia I've never heard of it. Is it the gas because of the property that dry ice has from going from directly from solid to gas (I think that's carbon dioxide could be wrong) or the cold temps flash freezes them? Doesn't sound that nice lol is there any other way I could do it without the dry ice?