Ambisonic microphones brands:

Rode https://rode.com/en-int/microphones/360-ambisonic

Sennheiser https://www.sennheiser.com/en-us/catalog/products/microphones/ambeo-vr-mic/ambeo-vr-mic-507195

Soundfield https://www.soundfield.com/#/products/st450mk2

Audio technica https://www.audio-technica.com/en-us/bp3600

Core sound https://www.core-sound.com/

Reynolds https://reynoldsmicrophones.com/collections/ambisonic-microphones

Mhacoustics https://mhacoustics.com/

Soyuz microphones https://soyuzmicrophones.com/013-ambisonic

Voyage audio https://voyage.audio/

Zoom https://zoomcorp.com/en/us/handheld-recorders/handheld-recorders/h3-vr-360-audio-recorder/

Oktava https://www.oktava-shop.com/?language=en

Mini dsp https://www.minidsp.com/products/acoustic-measurement/ambimik-1

Spcmic https://spcmic.com/

HD audio https://hdaudio3d.com/

Brahma microphones https://brahmamic.com/

Nevato https://nevaton.us/vr

Zylia https://www.zylia.co/

Ambi-alice https://www.instructables.com/Ambi-Alice-a-First-Order-Ambisonic-Microphone/