See if you can find another person in your area or even ask the LFS. Someone may already have a piece of sponge that's been in their system for a while that they will let you have.
One word of advise that is my experience is that unless you take great care to be very dilegent in cleaning any sponge that is in your system (ie just passive or in a canister filter) they quickly become nitrate factories. The only tanks that I have sponges in are my 2 JBJ Nano tanks and I clean them at least once a week when I change the water.
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