Yup! You even have a choice. Pick yer poison.
Amazon has had a fair amount for a while:
http://www.amazon.com/s/ref=nb_sb_no...oks+in+spanish
And Barnes and Noble just opened up a dedicate section:
http://www.barnesandnoble.com/ebooks....asp?PID=28507
People tend to forget the US has the second-largest population of spanish speakers on the planet. :-)
There's actually more spanish speakers in the US than Spain.
(Especially since they don't "really" speak spanish in Spain, but rather Castillian. )
Juuussst Kid-ding!!