I have been using IV 3000 preps below and above the sensor adhesive and I found out today they aren't covered well by my insurance since they're durable medical and I have a $100 deductible for out of network suppliers which mine is. For some reason the transmitter and receiver and sensors are under rx and are very well covered for me though. This company said they can get me 100 for $39, but I'm wondering if they are actually otc or if there is another substitute besides tegaderm which didn't seem to work for me. How about opti flex? Is that like iv 3000?