Dexcom at Costco questions

My doctor hasn't answered the phone, neither has my Dexcom rep.

So Dexcom is at Costco, I know that much. We had the application go through insurance and all and it would cost us about $1200 to get the Dexcom through insurance. How do we go about looking at Costco for getting one? I'm not sure if I should ask the doctor, the Dexcom rep, or Costco to start.

It's so easy to feel overwhelmed with all this and I'll admit... I'm feeling overwhelmed. It doesn't feel like anyone (IRL) is being helpful or by the time our conversation ends, I just feel more confused.