hrmmm - well, ATM - I couldn't really buy anything from any fandom - saving my pennies for Gatecon -
however, what would be really cool stuff from Charmed?
A Book of Shadows - doesn't even have to be a spell book - it could be like the 'official Charmed guide' or something - but it looks like the BoS and the writing's all pretty and colorful, but it's a big companion guide --- might get pricey, but it would be really cool!
Piper's Cookbook - both potions and actual recipes -
Phoebe's guide to levitation - could just be a funny book about lifting your spirits or something -
"101 ways to love a demon" - About Phoebe and Cole - or, could be expanded to an entire character guide - give it a subtitle bit like "...or a witelighter, or a ????"
or - do one book for each of the sisters and her love life --
(and I'm just pulling this stuff outta my head)
that a good start?