I buy them where convenient, but I learned one thing - all are not created equal. Now I stick to Pari or Respironics replacements (interchangeable) because the hard plastic mouth pieces on the cheaper ones are uncomfortable, and they don't always dispense evenly. I just looked at a couple of my sources and see they have both stopped putting masks into their kits automatically. Usually I use justnebulizers.com, directhomemedical.com, or whoever is cheaper on any given day. I see they have a new "enhanced" version with a valve that closes when you exhale to avoid wasting the meds - will try that next time.

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