Welcome @TopazRick, thanks for joining out community and starting off with a pretty difficult question.
My understanding is that the long-term cheapest solution is the 10-day Libre, however if you have a Costco membership you might want to check out the link below for getting the G6 at a reduced price for some indeterminate amount of time.
How to order G6 and other Dexcom supplies from Costco
Once the 14-day Libre’s get their communication system cracked, then the Libre will be the cheapest off of insurance that can communicate the way you want. Right now it appears some are having luck finding th 10-day sensors, but others are finding it difficult. Also, you need to purchase some additional hardware to get the Libre to act like a CGM. Something like the MioMio or Blucon