GaN transistors are about as cheap as Mosfets. The $750 GaN amp from Premium Audio also uses these same GaN fets. GaNs will be everywhere soon. Wyred for Sound has a $3K amp out soon with them......Mytek will have a $6K amp and some $20K mono blocks with them.....Orchard has a new one at $2500 with them.....and the beat goes on.
https://orchardaudio.com/shop/ols/products/strkrmsn-str-ltr/v/STRKRMSN-STR-LTR-BLK
https://premium-audio.com/mini-gan-5-balanced-power-amplifier.html
https://www.stereophile.com/content/wyred4sounds-new-aura-preamplifier-gallium-power-amplifier-rs-1-...
https://orchardaudio.com/shop/ols/products/strkrmsn-str-ltr/v/STRKRMSN-STR-LTR-BLK
https://premium-audio.com/mini-gan-5-balanced-power-amplifier.html
https://www.stereophile.com/content/wyred4sounds-new-aura-preamplifier-gallium-power-amplifier-rs-1-...