Les Productions Zvon has released Memory Collection 06 - More Sci-Fi, which features samples from 3 Public Domain science fiction movies from the early 1960s and 1 serial from the 1950's for a total of 714 WAV-format samples and a size of 520 MB. There's a free preview of 53 samples.
The samples include voice/spoken word/dialogs, sfx/foley and music.
Price: Donation of $7 (a bundle of the packs 01, 02, 03, 05 and 06 is also available).