Here is an add-in expansion card for 4x SATA II ports - uses PCI-e x1 slot.SYBA 4port 8 SATA II card $60
You'd probably be better off spending that $60 on a better MB with 10 SATA ports.
seeing the problem. Max 6 SATA ports on the mini-itx MBs
ASUS P8H77-I has 6 - most have 4