A study by Chicago-based Deloitte & Touche indicates real estate companies can save big money by purchasing supplies online. According to the study, online purchasing can decrease transaction costs for commercial office property managers by 70% per order, and by 55% per order for multifamily property managers. Cost savings result from streamlining the ordering process and reducing the number of supply vendors, according to the study. Other benefits include personalized shopping lists, online catalogs, customized order reminders and electronic tracking.