1. Take a simple carton with enough height, width and depth.
2. Go to your favorite home-improvement market (DIY-market) and buy some convoluted foam. Don't worry, it's cheap stuff! (Online alternative)
3. Now begins the funny part: Morph into Tim Taylor (


4. Now it's up to you how you bring your new "reverb killer" into position. It should anyway surround your mic and to make sure you can do recordings the open side should be in front of you.

If you did everything correctly, you should still have space for your popkiller.
Overall costs should be ridiculously low.