Is there any way to buy/read the short stories on their own?

Okay, I bought my first copy of Skulduggery Pleasant before the new ediions were published, when the pages had epic colours around the edges.

However, now the new editions all have short stories at the back :(

The only shorst stories I've got are 'The Wonderful Adventures of Geoffrey Scrutinous' and 'The End of the World', the World Book день story.

So, is there any way that I can get hold of the short stories separately? I really want to read them!