Yes -- anything by Smullyan is a pleasure to read. I think much of it is out of print, but should still be findable. "Lady or the Tiger" and "Satan, Cantor, and Infinity" were both good reads. "Alice," as well.
Yeah the link I supplied actually had a few people selling used copies. I got a first edition of it a while back and I still love to pull it out and go through the problems to freshen up my brain. :)
