The "add-on" card section of Newegg has some examples, in the "PCI Express to Firewire"
section.

http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=2000010073+118711761
9&Subcategory=73

For example, this is the Syba SD-PEX-NEC4F card. This is an example of a "bridged"
card. It consists of a PCI Firewire 1394a chip, plus a PCI to PCI Express x1 bridge
chip.

http://c1.neweggimages.com/NeweggImage/productimage/12-186-009-03.jpg

This Belkin F5U504 is a "native" solution, as it uses a single chip. The
chip supports three 1394a ports, and has PCI Express x1 for a hardware
interface.

http://c1.neweggimages.com/NeweggImage/productimage/15-108-009-03.jpg

There are also cards with 1394b (different connector, and supports
up to 800Mbit/sec).

   Paul