Casio SA-21 Mini Keyboard Synthesizer

The Casio SA-21 is the keyboard that defined a generation of Dutch kids in the early 1990s. With its 32 mini keys, 100 built-in tones, 5 drum pads, and that unmistakable New Kids on the Block demo song, this compact Tone Bank keyboard was the gateway to music for millions of children across Europe.

Originally released in 1991, the SA-21 became a staple birthday and Sinterklaas gift in the Netherlands. Its battery-powered portability meant it could be played anywhere — on the living room floor, at the kitchen table, or annoyingly in the back seat of the car. Today it is a sought-after nostalgia item for millennials who grew up mashing its keys.

RetroMarketCap tracks live Casio SA-21 prices across the European secondhand market. Complete units with original box command a premium, while working keyboards without packaging are the most common finds.