Opamp Labs 440C audio amplifier -- or use it as a subwoofer driver or table shaker (DC to 25kHz). Manufacturer lists it for $125 -- you can have it for $10 plus shipping.
Link: https://www.opamplabs.com/products/logic-module-plug-in/d-c-power-amps/440c.html One unit only. I think I purchased it in early 1980's:
Link: https://www.opamplabs.com/products/logic-module-plug-in/d-c-power-amps/440c.html One unit only. I think I purchased it in early 1980's:
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