Even if a domain name is set to expire it does not mean it will be available. I have all my domains set up for automatic renewal. Every year many people find out that dotcombot.com is set to expire and attempt to jump on it only to find out that one minute before it expires it is no longer available. I get several emails every year around that time with offers for it as well as most of my domains. Your best bet is to find one that is currently available or email the owner and make him or her an offer.
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