Not sure if this is allowed or not, and I haven’t posted in years, but upgraded to the G6 and now I have many boxes of G4/5 sensors that are unused. Some are out of date, but i always tried to use the old ones first and they were always out of date and worked fine.
I use xdrip as my receiver, which let’s you extend the transmitters and sensors longer than the official receivers, which is why i know have a surplus. Feel free to message me if you want me to mail them to you.
Moderators, if this isn’t allowed please remove and my apologies.