From a DIY perspective, ATS Acoustics, GIK Acoustics and others do
sell "naked" Compressed Fiberglass or Rockwool Panels that you can cover yourself. Of course, Ethan, ATS and GIK sell completed
and ready to hang panels as do others.
As my room is small (11 X 11), I have taken the advice of many to make
my room as sound absorbent (dead) as possible thus I have many square feet of absorbent compressed fiberglass in my room
and have will soon add one more 2 X 4 panel of Owens-Corning 703 on the left wall above my rack (which you
can see in the photo below behind the rack waiting for installation).
The DIY panels on the front wall are actually 6 inches deep with compressed
fiberglass sandwiched between 2-panels of modified peg-board with a 2-inch air gap at the rear ending in a solid wall
of sound deadening Homosote.
As you can see in the photos above and below, I have centered my mixing
desk as best as possible between the right and left walls and from a room acoustics perspective, I have also made sure
that my left wall has a different texture than what is on my right wall so as to not set-up any type of acoustic reflective
mirroring from wall to wall.