Sounds effects? I have loads of them. Some have been collected over the years from free websites, others were purchased from iTunes. One of the most useful sets I have came free with a Sony Vegas upgrade, still sometimes I find myself searching for that one specific sound. Anyway, these guys seem to be good, I was able to find some suitably spooky ambient sounds at the right price, with a clear license and I was able to download them very easily. Their license specifically covers games which is great.
Now to see if I can scare myself! :-)