A self-checkout system, particularly for retail areas of constrained floor space, has a small to zero footprint while being fully functional. In one form, the self-checkout comprises a unit mountable to a wall, pillar, or other support. In another form, the self-checkout has or is part of a columnar support. The self-checkout system has security in the form of video and weight verification. A visual and/or audio indicator provides indicia of modes of use of the self-checkout. The self-checkout further includes an interactive customer interface terminal, a scanner, and a scale. The self-checkout provides an open visual area that allows easy viewing by store personnel of transactions being performed on the self-checkout system.