Fictionwise does tend to overpriced for some books, and while writing in can help at times, it often doesn't.
I've faced the same problem for some books, and I ended up buying them from BoB when they had a sale. The only drawback was that as I've started to buy more and more of my New books in eReader as I can easily also read them on my iPhone (And converting to Mobi is easy, ereader2html and then Mobipocket creator).
Still, I'm glad that there is some competition between the bookstores to keep them honest