Hi @melissa-egtsgmail-com, we also had a previous post a while back. I will share that link here, too. I also like the Salter labs microcannulas, I believe it is 1616. I order mine from my local DME company, Apria. But, a close PHriend of mine orders hers off eBay. Direct Medical pops up with many medical; supplies. They must be cost-effective. Do you think so?
Here is the link to the previous conversation about nasal cannulas. Let me know if that helps you.
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