I have a friend who lost the case for her dior glasses and got a new one at a random store that retails dior glasses for $8. The same optical store sells Chanel, so it's worth a try to ask for a new case where you bought the glasses. My friend didn't buy her glasses from the store where she got the case, but again, this was a dior case so I donno if they'd be as willing to give out a Chanel case. I'm going down there with a pair of Chanel glasses to ask when I remember to.