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My daughter said that hers stopped working and needs to be fixed.
Its LED did not light when it had the high resistance of dry soil or nothing between its probes.

Duh! Its 3V battery was only 0.45V. It probably stopped working months ago.
A pair of new AAA alkaline cells fixed it.

New still in the original wrapping.

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It depends on what you're driving?

If it's a very low impedance load, <600R then use an audio amplifier IC, LM386, TDA2003 etc. for the output stage.

I don't believe that the design of an opamp provides for that low of distortion. But it might. Maybe two or three transistors would not provide the gain, impedance, or current capabilities, but it should produce better results because of simplicity.

Look at the datasheets of the ICs listed by audioguru.

Build an amplifier with a couple of transistors and compare its performance (in terms of distortion) to the op-amp equivalent and see for yourself.

Study op-amp theory and negative feedback and you'll see that if an amplifier with a high gain and some distortion can become a low gain amplifier with virtually no distortion when lots of negative feedback is applied.

Why not use an opamp? Its output impedance is almost zero.

An active filter adds some positive feedback at the cutoff frequency so the response is flat to the cutoff then a sharp slope.

A multiple-feedback bandpass filter can have any Q you want. A simple highpass filter then a simple highpass filter is a very poor bandpass filter. Both filters attenuate the frequency you want.

The TL071 single, TL072 dual and TL074 quad audio opamps are inexpensive and have distortion of only 0.003%.

The OPA134 single, OPA2134 dual and OPA4134 quad audio opampscost a little more and have distortion of only 0.00008%.

Two or three transistors have much more distortion.

I don't believe that the design of an opamp provides for that low of distortion. But it might. Maybe two or three transistors would not provide the gain, impedance, or current capabilities, but it should produce better results because of simplicity.

Some active filters are designed at resonance and some are not. It would seem that resonace would cause more problems in circuits. Doesn't a high pass filter followed by a low pass filter and an amplifier produce the same result without the added harmonics?