Where is the sonic fire extinguisher in the development stage?

Many pages but explains the scholarly part of it, but making one and selling it is something else.

Sonic Fire Extinguisher worked well on small fires, but could NOT touch the larger fires. The inventors are tweaking their idea to see if they can go larger for forest fires or large building fires. So it’s still in the development stage. It cost them $600 to make, so it might a little pricey for some people!!! Just guessing, they would cost $1–2K to buy the small home one. NO guess what the larger one would cost. Be patient, resrsrch takes time!!!