Where to look for a new baking book!
The local library.
If you are like me and own a few more baking or recipe books than is really... really required (yes, that's part of my bookshelf pictured), the local library is a great place to access more without having to purchase them!
And it's legal and free!
Borrow it, have a look through, see if it helps - some new books are great, others don't offer a lot of new material - and if it is a great resource then look at purchasing your own copy.
Otherwise, keep the $$ and put toward a special gourmet ingredient or helpful new baking tool. (...or a fun baking class!)