Stackable Locker Systems U.S. Door's ready-to-assemble lockers allow you to advertise storage at a low cost monthly rate, and not lose profits while doing so. Starting at only $145.00 per unit, these lockers can offer added rentable space to any facility. Fitting behind stairwells, in oversized hallways, or stacked together in unrentable units, these low cost lockers turn your now empty units into money making locker units. Various configurations and sizes are available. All units are now available with an all stainless steel door option. No drilling is required; all holes are pre-punched for a simple bolt-together assembly.