Are you looking at a tested, complete amplifier, or merely a powered-up one? At USD 30, this is a strong deal if the Fisher CA-38 is functioning properly: comparable examples appear around USD 37 with a known equalizer fault, while tested amplifier/tuner packages have reached roughly USD 80. That puts USD 30 comfortably in bargain territory, even allowing for its modest vintage-market status.
The CA-38 is a Japanese-made mid-1980s integrated amplifier rated around 30 watts per channel into 8 ohms, with phono, several line inputs, speaker switching, and a useful five-band equalizer. It is a practical, versatile little amp rather than a collectible heavyweight, but the phono stage and tone controls add real utility. Before buying, verify both channels, the equalizer, input selection, speaker outputs, and that the controls are not excessively noisy; at USD 30, a minor fault can still be acceptable, but a dead channel changes the calculation.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.