No-Intro should be pretty easy, there's significant chunks of the NTSC rom sets up on archive.org
I don't hoard like I used to, especially as I got into romhacks, but RomVault always seemed to be the way to go.
Now that I don't just keep full sets sitting around, I usually just pop onto archive.org and grab whatever I need from the nointro sets there. For disc based games, there's some redump collections on archive, but for most disc based past PS1 or Gamecube I have to check the piracy megathreads for whatever sites haven't been taken down yet.
