Borders has an in-store guarantee program that if the book is not there, they will not only order it for you, but ship it to your house for free. Also they've been very supportive of the Blood Coven series in general and would be my first place to try for a copy of Bad Blood or the other books in the series.
* UPDATE 1/6* I noticed that Barnes and Noble seems to be getting the books in slowly, store by store. Some stores had them before release date, some stores are just getting them today, some stores still don't have them yet. So again, check their website or call before you go. Also, right now I don't think they stock the first three books--just Bad Blood. So if you need those, you'll have better luck at Borders. Or you can always order them online.