If its a Titleist club I would recommend talking to your Titleist rep.  If it's not I would check eBay first, sine they tend to sell some spare irons on their.  Also you could try ironfinder.com.  One of those should work for you.

You can check golfsmith too. Or Play it again sports.

What type pf 7-iron did you have?  The 1st thing I would do is check with the club.  Chances are someone found it and turned it in.

A good idea is to have stickers with your name and club listed on it.  I ordered a set of DCI Black irons back in the 90's from Titleist and the set came with these shaft band stickers - not sure if it was part of the order, or from the club pro.  Either way, it was a nice feature.

I found it! Thank goodness.  The maintenance workers found it the next day and had it in the maintenance shed.  Thanks for the idea Todd, I think i will do that.