Abstract: An adjustable electronic device holder mountable to an elongated shopping cart handle includes a base with an advertising panel, a rear support attached to the back of the base at an obtuse angle, a fixed clamping member and a linearly movable clamping member attached at the rear support. Each clamping member has a concave gripping side, which may include a resilient gripping pad. An adjustable fastener, permanent bonding, or integral formation may attach the base to a handle. A deflectable pawl engages a rack along the rear support for locking and releasing the movable clamping member.