Here's a note to myself:
Don't ever (!!!) add books on a challenge list without checking their availability first!
In case you wonder why: I wrote down three books for the series challenge that simply are not available at a decent prize.
First off, there are the two Zetsuai books, that are only available used and for twice what they used to cost. And then, there's Tess Gerritsen's The Mephisto Club, which I'll have to buy (completely out of my usual habit) in English. That means it will certainly look weird on my bookshelf (I try to get my books in the same language and from the same publisher).
Now I'll have to see whether I can somehow get a hold of the Zetsuai books, and if not, I'll just try to read as many other books as possible, even though I won't be able to finish the challenge.