Just design and build it yourself. You will feel so much more pride when showing it off knowing that you done it all. This is the perfect one to start with as well, small enclosure with a single driver. Just decide where you want it to go and do as chrislun said, L"xW"xH"/1728 don't forget to account for speaker and port displacement. I think Sundown is recommending 12"^2 for port area.