You can save yourself money by just setting up a temporary 'chamber' each time you need to use one.
Its easy:
1) get a small plastic waste barrel, or similar container, large enough to hold the prey item(s).
2) get a small amount of dry ice (less than ~1lb).
3) place a portion of the dry ice in a cup of warm water, then place the cup into the plastic container with the rat(s)/rabbit(s).
The carbon dioxide that evolves from the dry ice will displace the air in the container, as it is heavier than air. It only takes a few seconds for the prey to initially pass out, then ultimately asphyxiate. It is painless, quick, clean, and the only humane way of putting down prey that I will do myself. Also, it is safe, as it doesn't leave any chemical residue in the prey animal's flesh (as chemical injections would).
Alternatively, if you can't readily get dry ice in your area, you could probably use a canister of carbon dioxide; though I'm not sure just where one would get such a thing.
Hope this helps,
- Mark
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