Check out this repository of 16,000 sound effects from the BBC, made freely available for personal, educational, or research use.
My favorite is this one, which will bring back memories if you were alive in the vinyl music era.
These 16,000 BBC Sound Effects are made available by the BBC in WAV format to download for use under the terms of the RemArc Licence. The Sound Effects are BBC copyright, but they may be used for personal, educational or research purposes, as detailed in the license.