Sorry about the John/Tyler mixup....sometimes I use my middle name John.
So what you're saying is, if you don't have the means to buy a canister of CO2, go ahead and use inappropriate equipment and use a method not condoned by veterinarians because it is not specifically written as inhumane.
I have a better idea.....if you don't have the means to buy a canister of CO2, don't euthanize mice!!! I know you probably think this is a ridiculous idea.
Tyler