Floppy drives are pretty cheap - I think I paid $12 for a Sony from Newegg
. However I'd check Microsoft's website to see if Vista has the RAID drivers for your mobo built-in. For example, with XP original (no SP) I had to either stick in a floppy with the RAID drivers during setup or create a bootable CD with floppy emulation (RAM disc) and copy the RAID drivers there, then run Setup from the DOS prompt. However with XP Media Center Edition the RAID drivers were included on the setup disc. Since Vista is even more recent it's worth a shot to check and see, maybe save $12
. Or just borrow the floppy drive from your old computer to use temporarily.