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M-D 0.5-in x 20-ft Closed Cell Backer Rod, Gray in the Concrete Expansion Joints department at Lowes.com
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3/8" Tundra Foam Open Cell Backer Rod | Open Cell Backer Rod for Hot and Cold Applications | RLOCBR38
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Titan Foam Soft Type Backer Rod - 3/8", 3600 ft. per box - Sealant Engineering Construction Supply, Inc.
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Backer Rod Foam Caulk Saver for Gap and Joint Concrete Filling Gray (1/2" Diameter x 32' Length): Amazon.com: Industrial & Scientific
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