Wanna "break up" with my Dexcom supplier -- tips?

I’m going to assume you want “in network” providers to maximize the amount insurance pays. Let us know if cost doesn’t matter and you just want great customer service.
Step 0: Acknowledge that all US DME dexcom suppliers are terrible horrible no good healthcare providers and you will be choosing the least bad supplier.
Step 1: Check your insurance benefits to find out what coverage and costs apply to dexcom. The three places you’ll usually find this info is A. In the Evidence of Coverage document B. Google [Insurance company name ] [state] CGM. Check for any change announcements, info sheets or policy carve outs for diabetes supplies. C. Search your pharmacy benefits formulary for dexcom to see if buying from a pharmacy using your pharmacy benefits is an option
Step 3: Skip if you are going the pharmacy route. Log on to your insurance providers web site and use the search to find in network DME providers. If you can’t filter by diabetes supplies here is a list of companies that sell dexcom as DME I have sourced from forums like this and Dexcom’s FAQ

Name Zip Web
Advanced Diabetes Supply 92009 https://www.northcoastmed.com/
Better Living Now Inc. (Rotech) 11788 https://www.betterlivingnow.com/
Byram 10605 https://www.byramhealthcare.com/
CCSMed 75234 https://ccsmed.com/
Diabetes Supply Center of the Midlands (Adapthealth) 68134 https://diabetes-supply.com/
Edgepark 44087 https://www.edgepark.com/
Edwards 44236 https://myehcs.com/
Healthy Living Medical Supplies 48216 https://www.myhlms.com/
Minipharmacy 90021 https://minipharmacy.com/
Pinnacle Medical Solutions (Adapthealth) 90074, 38125, 35630, 38672 https://www.pinnaclemedicalsolutions.com/
Solara (Adapthealth) 91913 https://www.solara.com/
US Med (ADS) 33122 https://www.usmed.com/
Wellstart Medical 34952 https://wellstartmedical.com/

Step 4: Get a price from your insurance companies contracted mail order pharmacy. If they quote retail prices ask if they can do it as DME.
Step 5: Using your insurance companies in network search filter for DME then search for pharmacies that might be able to bill CGMs as DME. Someone above mentioned Wallmart does this for medicare, maybe they also work with your insurance company. I’ve seen Costco mentioned before. I found a local mom and pop pharmacy that was still on my insurance companies DME list but they had just stopped.
Step 6: Hopefully at this point your have at least one option that isn’t Solara. Think about what matters to you and check the company out. Call them and talk to a rep and ask questions about matters to you. For example, when I was looking for a supplier I googled their name and lawsuit or data breech. I checked that their web site was secure and didn’t look like a kid hadn’t built it. Any phone rep that was reading me a medicare customer script when I said I had private insurance got eliminated. Then I searched tudiabetes and similar forums for others experiences. Keep in mind people usually only write about their bad experiences.

Good luck and let us know who you chose and how.

I use Minipharmacy. They aren’t good but they are small enough that the people in charge can be reached on the phone. I wanted to try Edwards but they aren’t in network for me. My experience with Edgepark, Byram and ADS have all been similar to your Solara problem. Adapthealth went on an acquisition spree during the pandemic. Companies they acquired seem to still be operating independently but expect changes in the future.