The cost of edging a flower bed can vary greatly depending on the size and type of flower bed, as well as the materials used. For a small flower bed, using simple edging materials like plastic or metal, the cost can be as low as $20. For a larger or more complex flower bed, using stone or brick edging, the cost can be upwards of $100. The best way to get an accurate estimate for your specific project is to contact a landscaping professional in your area.