OK, it's not like you otakus out there can't get your hands on terabytes of anime, but there are some stuff that are on the public domain and you can get them for free from the net and it's perfectly legal.
Here are some cheesy old school sci-fi mecha anime movies!
DOWNLOAD: Defenders of Space
DOWNLOAD: Raiders of Galaxy (1985)
DOWNLOAD: Space Thunder Kids
DOWNLOAD: Space Transformer (1983)