I have lots of vacuum packed frozen mice stored away. But I also breed my own mice, that's why sometimes I have to give them live to my snakes. I don't want to kill them by banging them against the wall or severing their spine, just not my cup of tea. I am thinking of getting a CO2 to kill them off humanely. So far I haven't been able to find any good prices, any suggestions on how you guys pre-kill. Thanks.