Does anyone know where I can purchase just a single (not pair) JBL N24 speaker? I got the NSP package for $250 and need just one more N24 to complete the 6.1 surround sound. I know some people opt to just getting bigger mains and moving a pair to the back or just buying a second center channel, but if I can get just one more N24, I'd be happy. If anyone is selling one or knows where to get them, I'd appreciate the info. Thanks.