When my crickets get too old, I put them in a bucket I keep nearby and spray them with a poison. Then they go out to the compost pile with all the other litter that was in their bin. For a few crickets you have left, just flushing them down the commode will probably work well. Drowning them in container of water is probably good, but you might have to ensure they don't get to the sides and climb out. At any rate, you have to destroy them. They can't be released as they'll eat any and everything outside. Anyone with a garden will talk bad about you<<grin>>

It does take a little space to raise your own crickets. Mine are on a shelf in the garage. I do wind up destroying thousands of unused crickets. Though if one is inclined, it could be a business to make extra money.