This doesn't really work. Everyone has convicts. Most stores will not give credit for them, and the ones around me won't even take them for free. This just goes to show just how truly prolific this fish is
Get a predator, or freeze them. If you were local, I'd be happy to take them as food. People with big predators will breed these to keep a steady source of food for fish that won't accept frozen or prepared
I am aware of what you are saying. However what I am trying to get at it is you can bring in a bucket full of convicts and tell the store you want to give them the bucket of convicts for free. Many LFS will not take them and you will have to take them home. Most LFS will NOT take them, no matter how cheap or free.