Epia M10000 Dual PCI Card ($15 + shipping)
Doubles the number of PCI slots on your M10000. Note that card faces to the OUTSIDE of the board.
Flexible ribbon cable riser card ($7 + shipping)
Gives you more flexibility when using a PCI card. Here is a photo of the actual card in use: http://www.dellabarba.com/ibug/images/ScaledDown/49.jpg
Buy both for $18 + shipping. PM if interested.