Old CGM Units

Hi all. I am very blessed to have pretty decent insurance coverage that allows me to replace my CGM unit every year for free after my deductible is met. I now have an extra Dexcom 7 and a Dexcom 7+ that work perfectly fine. Is it legal to sell them for a small price? Or can I give them to someone who might need the device and can only afford sensors? Not sure about the laws on this stuff.... just seems like a waste sitting in my closet, not being used.

Some people here frown on selling the devices but i have personaly bought & sold items on Ebay and craigs list with no problems..Its not like I am selling or buying medications just medical devices.

but thats my opinion, I just couldn't see letting the items go to waste when someone could make use of them.