1. A method of assembling pallets containing first and second stock units for use in the fulfillment of stock orders, the method comprising: providing a plurality of first pallets each containing a quantity of the first stock units; providing a plurality of second pallets arranged to receive the first stock units; issuing instructions with a control system on the fulfillment of stock orders; moving in response to an instruction from said control system a portion of the first stock units from at least one of the first pallets onto one or more second pallets in establishing desired quantities of the first stock units in the first and second pallets for use in the fulfillment of the stock orders; and loading in response to an instruction from said control system at least one second stock unit onto both the first and second pallets to form a plurality of assembled mixed stock unit pallets.