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.
There are times when the deer are simply not moving and you're forced to make something happen. Maybe you're up against a full moon or hot weather. This is when a silent drive to force deer to move should be considered.
By silent drive, you're not yelling and making a commotion to scare the deer. When deer are panicked, they're liable to bust out of the cover on a dead run, and any shot you get will be tough to make.
A silent drive is different. It means playing the wind to carry the driver's...