Here is the final volume, The Complete Peanuts Comics & Stories 1950-2000 with forward by the Jean Schulz. It consists of special comics and stories sold has a books during the 50 year run of Peanuts comic strip.
The previous volume can still be purchased in the US. Amazon.com still carries these volumes. The official current list of available The Complete Peanuts volumes can be found at Fantagraphic’s website.