Quite likely. The ones most often available by Derleth are:
The Mask of Cthulhu
The Trail of Cthulhu
The Shuttered Room (labeled as H. P. Lovecraft & August Derleth)
The Lurker at the Threshold (ditto)
Unfortunately, those labeled as by HPL & AD are (with one exception) almost entirely AD... that exception being The Lurker at the Threshold, which still only incorporates about three pages or so of Lovecraft material (somewhat altered from its original).
As for whether you should buy any of these or not... well, I'm torn when it comes to the Derleth Mythos stories. On the one hand, I encountered them at the same time I came across HPL's own work, and enjoyed quite a few of them -- still do have a fondness for several, and even in those I don't, I find some fascinating concepts. But, to be honest, they are seldom good stories, being full of contradictions, often slipshod writing, and also being repetitive and/or overly derivative.
That being said, you might want to check out some of this through a library, if possible, before investing in it, and see. If you like what you read, then buy the book; but get a taste for what Derleth's take on the Mythos is like first; as Robert Bloch said (this is a paraphrase): "he [often] hit the notes but missed the music".