I e-mailed Lakland about getting Chisonics separately and you can, but not without covers.
I really liked the sound samples on Lakland's sound page. They also sounded great at the open house last year
http://www.lakland.com/ac_j-sonic.htm
Why would you want them without covers?
For a custom build/wood covers. Does not matter at this point as they want $150 each-