So, the G7 is the high end sensor for actual diabetics that need more frequent measurements (5 minutes) and real time alerts for values out of normal range, and still require a prescription.
Dexcom got US FDA approval this summer for a sensor (the "Stelo") that doesn't have all the bells and whistles, and is aimed at people not insulin that want to track their metrics.
They are marketing it for $50 per two week sensor or $45 with a recurring purchase.
There are 2 or 3 other ones like it now without the need for a prescription, but the Dexcom Stelo was the first.