are they food for a puffer or to eat plants turn over your substrate might help if you where more specific I have some but you might not be looking for that species
scot
i have some giant columbian ranshorn young for sale.
Not free as you wanted but im only wanting 50p each for them.
Let me know if you are interested.
Kat
i have some i can send they are just pest sails and grow about a 1cm but i can catch some smaller ones, the breed like nothing and u will have tuns of them in no time. i had to buy a clown loch to keep the numbers down
chris