In the picture above is my 2016 honda accord with its cup holder clips. Today one of them wasn't moving so I took it out and discovered that there is no spring. I was wondering if there is a place where I could buy the spring to make it functional again. Thank you.

 

I looked quickly at an OEM parts site like hondapartsnow.com and didn't see one, so you likely can't buy only the spring. The spring came loose for some reason, so hopefully the plastic holding the spring didn't break. The spring went somewhere, so you may want to remove the cup holder and find the spring and reinstall.