I know that. =p
Constricting Rings were decided to be too powerful by Blizzard and were removed during the transition from 1.07 to 1.08, however, those that had already found them were allowed to keep them.....which was about a good 1000 people. About 150 legit Constricting Rings exist now, the rest are all dupes.....
I was asking for a price check, because I've seen people offer MULTIPLE unid Windforces for them....so, consider about 35-40 sojs per WF, and you're already racking up the cost....