Hello folks! I stumbled across a cool cheap solution for getting some isolation in my home bedroom studio:
I acquired some leftover acoustic foam from my brother, so I decided to glue it to the inside of two bi-fold closet doors I had laying around. At first it didn't want to stand up on it's own, so I added 2 wood braces at the top. For this I just drilled holes in some furring strips and attached them to the already installed "track guides" on the closet door. I put some extra holes in the wood, so I can adjust how "open" the booth is. And when I'm not using it, I can spread it out flat and lean it against the wall.
Right now the pictures show it as basically a half circle, but I can open it wider to accommodate my acoustic guitar. This set-up was free for me, but I priced it out at about $200 if I had started from scratch. It works way better than the sE reflection filter I was using. Enjoy!