Soundsnap

[JayRay]

Checked it out, read up on its terms of use and license.
Seems legit. :)

However, still consider supporting your indie audio creators.

I did, Arteria3d is a one-map operation out of the UK... and I bought all my main tracks  (77 of them)

But, finding people willing to go out and do a sound test for each weapon, elemental effect, and more seems a bit daunting, and expensive.