NAS Built, still need parts

Ha, so building up an old PC to be a NAS isn't all that hard. Just getting two different brand computers to combine into one was the big difficulty. Now I have an ugly, but functional NAS device, but sadly, between the two PC's neither had a network card so I'm in need of one in order to fully claim I've got a NAS. I used FreeNAS for the software and was able to load that fine, and until I get the network card, that's as far as I've gotten... Progress, but I sure would like ot use new parts for once!