Garlic is super-easy for the home gardener and organic garlic bulbs can be found at the grocery store. Here are some great directions for planting and harvesting garlic: "Any Home Gardener Can Grow Garlic" by Paul Pospisil.
Or, find a two page easy to print summary of the directions at http://garlicfarm.ca/pdf/growing-garlic.pdf.
Looking for exotic garlic varieties? Try Boundary Garlic Farm.