It might be a licensing issue...? : (
You could see if the ebooks are available here - https://www.samhainpublishing.com/books/series/173/cambridge-fellows-mysteries - or if you wanted paperbacks, you could pm charliecochrane and she might be able to get them to you directly? She's very nice, I'm sure she won't mind : )

I get ebooks. Mostly I've been following authors that I like on FB and they often rec other people's stuff and let everyone know when something's discounted, which I find is the best way to try stuff out and see if I like it. I probably will buy paperback copies of my favourites, but probably in September at UKMeet, coz then I can get them directly from the authors : ) x