[X4U] SATA PCI Controller Card Recommendations?

[Neil]

I'm looking for an inexpensive SATA PCI controller card to put in my  
Quicksilver G4 and turn it into a NAS.  The card should be bootable in  
either Mac os or Linux and have at least four ports since I only have  
two open slots and I need eight drives.

I think I saw cards like that a few years ago that were only around  
$70-100, but I don't remember where I saw them.  Any suggestions?   
Thanks in advance.