The amplifier that I'm using for this project is about $25, which is a very reasonable price. The photo doesn't do it justice, but the blue lighting around the knob and the chrome plating are beautiful. Most importantly, it sounds pretty nice. It didn't cause much distortion when cranked up.
The speaker is only $10, and it can handle some pretty low frequency (low enough to resonate the PVC pipe around 180Hz), and it can produce some high frequencies too. I played some commercial recordings, and they sounded surprisingly good for a $10 speaker.
(if anyone is curious about how they sound, feel free to ask me and try them out)
Amazon: Amp & speaker
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