Books. Buy people books. Like these:

An omnibus featuring the first 3 of Pratchett's "Death Family" sub-series for his Discworld series. And thus a good way to introduce people to the series...

First book by Jasper Fforde for his Thursday Next series...

The first book in the Exordium pentology, quite possibly the finest work of space-opera fiction ever written...

The autobiography of Mick "Mankind" Foley. A good book for wrestling fan and non-fan alike. Mostly due to Mick's honest, amusing and surprisingly skilled writing...

A teen romance book. About high school basketball. And I
still reread it regularly.

The first book of Butcher's Harry Dresden books. Especially good for those modern horror/fantasy fans in need of a break from the more estrogen infused books in the genre. Or just for people who like awesome books about modern day wise-cracking wizards who fight with demons, deal with the cops and try to pay their rent...

Its Pratchett PLUS Gaiman. Writing about the end of the world. Do you know how often I have to rebuy this book after lending it out?
Best place to find prices on new & used will probably be
Fantastic Fiction