Leeches
Really easy to catch your own if you have access to a slough or dugout.
Take a clean paint can, put a rock and a piece of liver in it, close it up. Punch a bunch of small holes around the outside with a small nail. Tie a rope on the handle and toss in overnight.
Come morning, pull it up and peel the leeches off the side of the can.
Free & easy.
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