@aeonofdiscord
If you don't like what either of those sites have to offer projects-wise, perhaps you could consult your local library (if you have one) to see what electronics books they have - ones that focus on audio electronics would have a detectable result with a speaker or audio jack of some sort

I guess one BIG barrier would be the power supply though, I think those have a fairly hefty pricetag unfortunately. Perhaps see if you can get one at a better price on craigslist or similar?

you can build your own but twiddling with mains voltages is scary stuff