an Never go out of tune under ANY circumstances
percussive instruments like a xylophone or chromatic bells would ,unless you damaged it , never go out of tune,but they tend to be expensive
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Favorite Answer
A synthesizer (of varying prices) or maybe a toy piano, though some might be more expensive than others -- http://www.youtube.com/watch?v=EIPtKgGedsk
This Schoenhut toy piano is under $50 --
http://www.buy.com/prod/schoenhut-my-first-piano-ii-white/q/sellerid/11981947/loc/20269/211906459.html
http://www.youtube.com/watch?v=uhhChMjtuAQ -- I just wonder if temperature might cause it to go out of tune.
Maybe a electronic toy piano?
http://www.youtube.com/watch?v=4A_A6Ld68ZA
clarinetist
All instruments will eventually go out of tune, and almost all are tuned to A-440. Some instrumentss that are "C"Instrumentsts are flute, oboe, and piano. Also, there are not really any "cheap" instruments. They may be cheap if you buy them secondhand, such as at a garage sale.
Tommymc
Harmonica or blues harp.