Many sex toys are manufactured for other purposes. They can often be purchased for much less than the sex stores charge. Often the hard part is simply finding out what something is called or what it's original use is. Once you know that, Google is your friend.
This is a growing repository of what sex toys were manufactured for, what they are called, and where to find them.
I'm always looking for more information. If you know the real purpose for something or where to get something cheap, send me mail at Don@CheapBDSMToys.com.