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Around me you can buy from second hand shops with £10-15. :D
But, you can maybe even learn to sing a song or two. One of my secret tasks was to learn to sing a song on guitar and piano. So last year lockdown, i got a guitar, is doing wonder for fingers dexteriti, i may say even that learning to use a guitar increase my typing speed at 200%, indirectly. That's why I mentioned.

Edit: thew only song that I remember now is happy birthday, but still if i do it for someone birthday they are impressed , haha!