The most famous circuit bending in Japan (Patreon)

Circuit bending, that is, modifying existing electronic instruments and toys to enjoy new glitchy sounds.

Worldwide, the speak&spell modification is well known.

In Japan, the most famous is Pikaremin, created by a creator named Kaseo.

It is a modification of Pikachu, a 500-yen Pokemon toy, with pitch control.

You can get it for $100 to $200.

https://www.youtube.com/user/Kaseo 

Kaseo has produced more than 700 Pikarmins, each of which is assigned a unique decoration and serial number.