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Conventional Concrete Block. Most concrete building block come in an 8-by-8-by-16-inch size. According to the National Association of Home Builders, these blocks tend to cost around $1.30 per block. As of February 2011, Lowe's home improvement center offered single 8-inch concrete blocks at a price between $1.19 and $1.32 each. Buying in bulk can reduce the cost of your blocks.
Individual, Pre-Formed Blocks. The cost of standard, pre-formed concrete blocks will range from approximately $2 to $3 per square foot. The cost of standard, pre-formed blocks for a project requiring 200 square feet of landscape curbing would total about $400 to $600.