I bought these from amazon: "Skin Grip CGM Patches for Medtronic Guardian Sensor..."
https://www.amazon.com/gp/product/B07G9T92TB/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
Work pretty well for the 2 weeks the sensor lasts. Kind of hard to get off but I guess that is the point.