An adjustable bracket assembly for mounting an electronic display device to a shelf, such as, for example, a shelf of a retail store. The adjustable bracket assembly allows for the mounting of an electronic display device to shelving of different width and does not require any alteration of the shelving. The electronic display device may be mounted at different locations with respect to the shelf. The design of the adjustable bracket assembly preferably allows for useable shelf space to exist behind the electronic display device once it is installed to the shelf. The adjustable bracket assembly may also allow for attachment of a printer, or a printer housing.