Mark Drug Medical Supply (Wheeling, IL) – Authorized dealer for insurance-covered medical equipment.

Sites like Medical Department Store sell cylinders, but they still require a doctor's order for filling or purchase. 🏃 Supplemental & Recreational Oxygen (Over-the-Counter)

Medical-grade oxygen is classified as a drug by the FDA and requires a prescription for purchase. It is typically 99.2% to 99.5% pure.

Finding "pure oxygen" depends entirely on your intended use—whether for medical therapy, athletic recovery, or industrial work. 🏥 Medical-Grade Oxygen (Prescription Required)

"Consumer-grade" oxygen is sold in lightweight canisters for sports, altitude adjustment, or general wellness. It is generally 90% to 95% pure and does require a prescription. Reliable Medical-Orbit Medical of Chicago

D C Medical Supplies (2419 W Madison St) – A long-standing local supplier of durable medical goods.

You can obtain tanks or concentrators from licensed durable medical equipment (DME) providers. Local Options (Chicago Area):