The Iowa and OLPC groups immediately come to mind. 

http://www.csounds.com/other-resources

Can you specify what is missing from those of these two ? 

[As there's a chance that might get picked up on, 
and got around to being provided, perhaps]. 

> I am aware that free samples exist, which is good, but I need a
> certain minimum quality level and some free samples don't meet that.
>
> So I would like recommendations where to look for samples that include
> a variety of dynamics and attacks, and come in plain aiff or wav.



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