Check out Onju. You can buy the PCB from pcbway or there are some other options coming: https://www.crowdsupply.com/onju/onju-voice

Can always build to your own spec: https://www.espressif.com/en/products/devkits/esp-audio-devkits

I simply use an USB conference speaker/microphone plus the Assist Microphone add-on. (in my case this one from Microsoft, it works great with my RasPi.)

I actually prefer that over the Echo or other embedded devices, as it is able to pick up my voice from further away and the output audio quality is much better. (My use case is something similar to commercial proprietary systems like from Amazon/Google.)

The M5Stack Echo I use on my night stand with push to talk for quick actions, for that it is enough.