I can find it on the Kobo site, however it appears to be compatible only with their iOS and Android apps which likely means a format other than ePub....
http://store.kobobooks.com/en-US/ema...ion-and-fact-5
http://store.kobobooks.com/en-US/ema...ence-fiction-5
No idea if the version B&N sells is ePub either...
http://www.barnesandnoble.com/w/anal...=2940000281574
http://www.barnesandnoble.com/w/asim...=2940000281604
EDIT: I see Graham says the B&N version is ePub, so that might be a solution for you.