Then the Colorado Outfitters Association, and if not them, maybe Craig'sList or the local newspapers (everyone's online now anyway). I know I have heard of transferable tags before being offered in Craigs List.
Having said that, nearly any land of significant size is already outfitted. There is certainly a chance of finding something small(1,000 acres or less), but small parcels may not always reliably hold animals without crops or at least a major drainage. Because of the down economy, some outfitters may be overextended and underbooked, so I would think a sub lease to be the most likely bet for you.
Every year my Pro-Staff and I head to the woods to hunt the old wise Tom. We travel thousands of miles covering numerous states hunting these old guys. Lots of times we end up hunting public lands or private property that have been hunted already. That’s the last thing you want to hear when you just traveled 6 hours that someone else has already hunted the property. We had to come up with a game plan and one real fast.
The first thing we did was ask the farmer were they usually see the birds in...