You can get an extremely shitty one for 20 dollars https://www.instructables.com/Flea-Scope-18-Msps-13-BoM-WebU... but when you are just starting its pretty cool!
The cheapies are less useful for debugging real problems, due to their bad UI and severe limitations.
A good, fast reacting multimeter is likely better thing to get than a cheap scope.
That said the cheapies might be usable for debugging audio stuff.
I think that's probably true, but for learning stuff I think an oscilloscope is way better than a multi-meter and the cost is prohibitive so I love the flea scope to give to noobs.
I am also very much in the belief system that you should not buy an expensive tool before you are frustrated with a cheap one, most of the time people get into random hobbies and bow out six months later with way too much crap on their hands, and often time tools are more for show than for real world use.