I'm not sure where your nearest book store is, or the quality of content that they normally carry, but from my school there are about 12 different stores, of both used and new content. I have found books dating as far back as maya 4.5 in my travels.

I might suggest checking out computer stores as they are often "blowing out" books. Whats great about this is that they are outdated books by software standards and while it takes time going through hundreds of books you will no doubt end up finding a book you need for about 10% of its original cost.

If you want me to keep an eye out on things here and see if I can't ship them to you I will see what I can do. But let me know.

Just found one you can order online for 25$
Inside Maya 5