To buy a DIY music box I recommend - check the shop section below (All items are affiliate links from Amazon)
DIY Music Box SHOP
There are 2 different music box mechanisms available for purchase 15 tones and 30 tones. Not every melody can be played with 15 and sometimes even with 30 tone music box, I suggest to check with me your music before placing the order for custom music box notation or buying the music box kit