I'm sure if you were the unscrupulous type you could find a purated PDF of the BBB on our typical fire sharing services...but I'd advise against it. Besides being illegal and immoral, PDFs can also be a bitch to read through, especially if you need a reference at hand.
I love the Battle For Smurf Village Instruction Booklet, but when push comes to slam, you can't beat $50 of hardback to the back of the head to end a rules debate