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One way is to advertise them on your local buy-and-sell website. http://www.craigslist.org/ and http://www.kijiji.com/ are the two biggest.
Another way is to register at the Old Woodworking Machines forum website, http://www.owwm.org/ and then post an ad there. Actually, it's not quite that fast. You have to register, then, once you registration is approved you carefully read the rules and then you post your ad. The ad won't appear immediately because it first gets checked for conformance to the rules. Once the ad appears, it will be seen by hundreds of people who are specifically interested in machines like yours.