A stupid question so bear with me.

I bought a bottle of shampoo mistakenly instead of conditioner which I wanted to buy. I already have a 1L shampoo bottle which would last a year. It's pretty pricey for someone like me and I'm a student so I want to resell it. Should I go to the grocery stores near my place to resell or would they kick me out. It's unused and unopened and I bought it on Instamart which has no return option.Any suggestions on places I can resell it?