Nevermind.  I figured it out.  The subtotal is the lower price plus    When I added the shown prices for these the numbers matched perfectly. A bit confusing, but all is 
Not sure if this is a mistake or if I'm simply not understanding.  Can find no info anywhere.  I have ordered - its confirmed but not yet in production or shipped - and Alienware R10.  It says:     How does it go from 2167.74 to 2624.16?  What is this subtotal?  I'm just confused and if anyone can help clarify this for me I'd appreciate it.  
Pricing / Order question