You've heard the old adage: "You get what you pay for." This is generally true when it comes to paper shredders. But that doesn't mean you can't find an affordable shredder that will get the job done.
The trick, whether you're shopping for a home or business shredder, is to do your research and make sure you buy "enough" shredder to meet your needs, now and in the predictable future. But make sure you don't overbuy, or you'll just be throwing money down the shredder, er, drain.
You can buy a quite serviceable desktop or home-use shredder for $50 or even less. You'll probably want to spend more than that for an office shredder that will get even light or intermittent use. Beyond that, there are so many types and styles of shredders that "cheap" is in the eye of the beholder.
If your documents are not so sensitive that you worry about thieves taking the time and trouble to retrieve them and piece them together, you'll probably be able to save a little money by choosing a strip cut shredder instead of a cross-cut shredder. If you don't need the capacity to shred credit cards and CDs, you can save money there, too.
Read online reviews to see how other customers have experienced the shredders you have your eye on. Amazon.com is a great spot to check out reviews, along with office supply store sites and other venues. Of course, ask around among your friends and business associates.