WHERE CAN I BUY A FIREWIRE CARD FOR A ACER M3970

Http://www.ebay.com.au/itm/NEW-2-port-FireWire-1394-Adapter-Express-Card-PC-/160607071799?pt=AU_Electronics_Accessories_Wires_Cables&hash=item2564ed6e37
$15.54 free postage to certain countries
You might get these on Ebay im not sure which country you are in this might guide you to one
you could get this on Ebay if you dont have an account you will need to create one
Add Email adress
Add Bank Acc
Add Credit Card
also add your postal adress
also add a paypal account
when you get to the paypal login page at the bottom you will see new to paypal sign up tab
paypal to create an account
paypal registration password ,bank card /credit card,phone numbers home/mobile ,email adress and a postal adress
be very specific when you type in the search
always ask questions? before you make a purchase and keep the email/s for security reasons if the item arrives and its not as described
you will even see the pictures of your item so you cant make a mistake and get them home delivered
hope this helps

According to the specs I found on your computer, it has 3 (total) / 3 (free) x PCI Express x1 ports:

So It appears you need a pci express x1 card: I think this one should work for you.

Amazon Link