A look at what is currently available on eBay
 Cybex AutoBoot Commander 4XP 6*XPAC Modules 2*XPST+2*XPSR+6*XPAC+3*XPDU US $139.99 
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 Cybex AutoBoot Commander 4XP 4*XPAC Modules 2*XPSR+2*XPST+2*XPLU+2*XPDU+4*XPAC US $129.99
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Items recently purchased from this site
Cybex AutoBoot Commander 4XP 6*XPAC Modules 2*XPST+2*XPSR+6*XPAC+3*XPDU, Cybex AutoBoot Commander 4XP 4*XPAC Modules 2*XPSR+2*XPST+2*XPLU+2*XPDU+4*XPAC,