Since you didn't tell whether your talking about online source or not. For online help you can always get the replacement stoppers for thermos brand bottles from any of websites that offers you brand new or used replacement parts.I am sure that the following website will help you out.   www.thermosonline.com

Hello. Last year I brought my husband a "Rock" thermos that cost $100 because I thought it was good quality product. However the bottom of the stopper fell off as well as the rubber ring and I have thrown out the reciept so cannot return it to Brisco's. As it has a lifetime warranty I … Read more