Older thread, but I'm so sick of seeing my name up there for the "Tip, Prepping for free..." thread.
Worms are a gardener's best friend. I don't buy worms, but I do try to attract them. You can take a 5 gallon bucket, drill 8 or 10 X 1/2" holes around the sides near the bottom, and bury the lowest 4" or so in your garden beds. Throw your kitchen waste in there and put the lid on and worms will come for the free meal. They really like watermelon rinds and will reproduce like crazy if you feed them some, but any organic stuff will do.
Worm farms (or vermiculture) usually use a special kind of worm called a red wiggler or compost worm. Worm castings are one of the best fertilizers, and the liquids they produce are an excellent all-around plant tonic. YouTube is full of info about vermiculture, and it could be well worth doing since their poop retails for almost a buck a pound.