Monroe Systems is a Philadelphia-based supplier of printing calculators and business office equipment, trusted by professionals since 1912. They stock a wide range of products including factory-certified calculators, printer toner and ink, paper finishing equipment, shredders, and office supplies. The company operates Monday to Friday, 8am to 5pm EST, and offers flat-rate shipping of $9.99. They are well-suited to receive referrals from businesses needing reliable calculators, toner supplies, or other standard office equipment.