I get mine killed, but if they deny then i freeze them an thaw them out next feeding and my snakes take them easy.
Though my male likes pre/thawed killed more then my female does.
I know lots of people who throw out dead animals in the trash. [Mostly rabbit breeder since i know more of them] But, i do not think that's allowed, i am pretty sure animal services is supposed to take all dead animals even if they are babies.