How to get rid of insulin safely?

I have switched to the pump and have a lot of left over insulin. I don’t know how to get rid of it, my doctor told me they have a medication dump every six months but this is perfectly good insulin that should not be thrown away and plus I just missed mine in my town. Does anyone know if a place that I can donate to be reused? A doctors office or maybe a Salvation Army thing? These expire next year and some 2020 so for the 2019 ones I need to do something ASAP! Please msg me. Thanks.