Got this on amazon with the collectors edition undertale! Music box inside that plays “his theme” and I love it! : r/Undertale
Undertale Collector's Edition - Video Game Shelf
My heart locket finally arrived : r/Undertale
Monkey Music Box Locket Heart Shaped Locket With Music Box - Etsy
Rose Quartz Heart Music Box Locket in Bronze – Char's Favorite Things
Amazon.com: BHJKL Commemorative Gift Crystal Heart Music Box Wind Up and Golden Movement Music Box Transparent Mechanical Music Box Gift for Christmas,3.1x3.1x1.6in Exquisite Music Box (Color : Music Track 2) : Home