I've been using
Zapsplat its free as long as you give them credit which I dont mind. The only downside is you can only download 3 effects/sounds every 15mins. I just pick what i'm looking for then download the 3 then by the time ive read this forum and replied i can go back and get another 3 and so on, if you sit there seaching the net you'll have everything you need in an evening or 2.