A portable data collection device adapted to be mounted to a shopping cart includes a housing having a clamping assembly for releasably clamping the housing to a pushing bar of a shopping cart. The housing defines an interior region supporting device electronics. The device further includes an interactive touch sensitive visual display screen and a retractable, tethered dataform reader releasably mounted on the housing. When mounted on the housing, an imaging assembly and an illumination assembly of the reader are continuously actuated to read a dataform presented to the reader. When removed from the housing, the reader is actuated by depressing a trigger on the reader. The device also includes a magnetic stripe reading assembly and communications circuitry including a radio transceiver module.