I frequently monitor listings in Gilbert, AZ on ZipRealty- watching for increases in listings, price reductions, checking Price/SF, etc. I noticed today that two of the oldest properties I’ve been watching became the two newest listings I’ve been watching- one didn’t even change the wording on the ad. This brings the relists I know of up to four, although I haven’t really been monitoring them.
For those of us without access to the MLS, it is difficult to track relists. A spokesman for the MLS in Massachusetts last year gave a rate of 6.5%. (See article)
I started suspecting that number is higher when I stumbled upon the website of a realtor named Lanard Perry. He wrote an article called The Best Way to Get Real Estate Listings.  In it Perry pitches his book called “Farming Expired Listings - Your Personal Guide to Success.”