Packt is offering two ways to get your cheap book fix.
Mega-Bundles consist of books selected around a theme, 15 for $50.
Build your own bundles are 10 books for $40. There is a great variety to choose from, including everything this blog discusses and much more besides.
Some of the books are shortish – 100 pages or so. You can see the page counts for the individual books. Of course length and quality are two different things.
Time may be short, so check these out soon. If you recommend particular books, leave a comment.