Conrad Johnson CA200 has this feature. A used one will sell for between $3-3400. I used one for years and wish I never sold it.
Integrated Amp with Separate Volume Controls
I have a hearing loss of about 3db in my left ear. Because of this, the soundstage is slanted to the right side for me. I am looking for a solid state integrated amplifier in the range of $3000-$5000 that has separate volume controls for each channel-that way I will be able to adjust the volume controls to hear a balanced soundstage.