Seems like the sock thing would work...I'd just be carefull about what's left you know? smash it too hard and you'll be fishing pieces of god knows what out of a sock...too soft and it might not kill it in one go.
Just some food for thought...
Btw : anyone ever wonder why it's called CO2 POISIONING? I always worried it might cause some kind of reaction in the mouse/rat's body and then you give it to your snake....I suppose they can handle it since a lot of people use that method, but again, just wondering if anyone's done any kind of through research on it????
Also, yall know how criminal profilers say cereal murderors kill small animals....does that ever bother any of yall? I kinda think about it every week around feeding time....