Exactly the reason why when come the time of starting breeding my own rodents (very soon), I plan on using a CO2 chamber like this http://www.thereddragonsden.com/co2.htm

A little investment to start with but not as messy and my best option since I can't seems to find any Dry Ice around.

Yeah I know i could feed live to avoid the problem but I love the convinience of always have the proper size available and what matter the most it work for my BP too they are all F/T feeders.