Hey does anyone out there know how to find or download some full games from years gone by?  I would love to get my hands on any of the following games:

SB XXV

90 NFC Championship

1990 Giants/Niners game week 12

SB XXI

Etc... I have all of the stuff from their playoff run in 2007, but I have always wanted to go back and watch some of these games from my childhood, beyond just highlights, and I was wondering if anybody could offer any ideas or help.

Thanks!!