a frame removably mountable to a shelf;

a support arm extending generally perpendicular to the frame via a pivot mechanism and configured for removably mounting a product on the support arm, the pivot mechanism comprising:

a lower portion fixed to the frame and having a first angled contact surface; and

an upper portion on which the support arm is fixed, the upper portion having a second angled contact surface configured for reciprocating up and down and rotational sliding engagment relative to the first angled contact surface,

wherein the pivot mechanism is configured to enable pivotal movement of the support arm between a first position in which the support arm is generally parallel to a front portion of the shelf and a second position in which the support arm is moved upwardly from the first position and extends generally outward at an angle that is generally perpendicular relative to the front portion of the shelf, and wherein the pivot mechanism is biased to return the support arm from the second position to the first position,

wherein rotational sliding engagement of the upper portion relative to the fixed lower portion in a first rotational direction corresponds to pivotal movement of the support arm from the first position to the second position, and

wherein rotational sliding engagement of the upper portion relative to the fixed lower portion in a second rotational direction, opposite the first rotational direction, corresponds to pivotal movement of the support arm from the second position to the first position, and

wherein the pivot mechanism comprises a stop mechanism configured to limit rotational movement of the upper portion relative to the lower portion in the second rotational direction and to enable unrestricted rotational movement of the upper portion relative to the lower portion in the first rotational direction.