During the Auction house quest of the Heart of Stone expansion I encountered an old lady collecting everything Witcher related. I can't remember her name, but she was a countess.
During the conversation I had the option to buy the Viper armor from her, but I didn't because I wanted to fulfill her task first. After completing the task she became unavailable. I could not start a conversation with her.
Will I have another chance to buy the Viper armor or was this my only chance?