A seller named "Naka6769" placed a K-ON! guitar signed by the anime's voice cast for auction on Yahoo Japan on May 22. As of May 27, the bids reached 5,561,000 yen (about US$69,800) with 307 bids. The guitar is signed by Aki Toyosaki (Yui), Ayana Taketatsu (Azusa), Satomi Satou (Ritsu), Minako Kotobuki (Tsumugi), and Yōko Hikasa (Mio). It also includes a case, Azusa stickers, beginner's manual, and sheet music for Azusa's character song "Jajauma Way to Go."