Abstract: An in-store advertising cover for installation onto and covering an upright security fixture includes a pair of front and rear, arcuate panels joined together along side, linear edges to form a lens-shaped cross section when the fixture is covered. A crease extends transversely across the arcuate panels between the side edges. The arcuate panels are foldable about the crease when the fixture is not covered, for example, during shipping, and are unfolded during installation. A lower half of the cover is initially installed on the fixture, followed by an upper half. Advertising material is applied on one or both arcuate panels. The advertising material is visible when viewed off to one side of the respective unfolded arcuate panels.