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Walmart [walmart.com] has the Woods Black Photoelectric Light Control 59413 (photocell) for $1.52. Shipping is free on orders $35+.

Amazon [amazon.com] has the Woods Black Photoelectric Light Control 59413 (photocell) for $1.52. Shipping is free on orders $35+.

NLA:
Home Depot [homedepot.com] has the Woods Black Photoelectric Light Control 59413 (photocell) for $1.52. Shipping is free. NLA