Blue slip dresse

As I am moving away for school soon I have to leave some of my favourite clothes behind 😞 I did thrift this dress and only saw after that it has a few “oil” type stain as shown in the pictures. They’re aren’t noticeable at first but you can slightly seem them from close. I do not know what brand or the actual size of the dress as it didn’t come with tags. I could say that it fits a small or medium. I’m always willing to negotiate and open to offers! Can be part of my dress bundles offers but I am selling it for way cheaper because of the stain (so maybe not worth the bundle in your opinion)