Buy some goats.
With regards to Big50's comment, look into "renting" goats. It has been many years ago, but I remember a trip to Missouri years ago when I was told that some folks rent out goats for land clearing. The only issue might be that one would have to erect some temporary fencing in different places to keep them contained to the area one wanted cleared.
That may be more trouble than it's worth.
I've not worked with the meat goats, but my parents had dairy goats, and they were a pain to keep inside fences. I've heard the meat goats are a bit mellower. Might be something to consider, since they'll get to brush and stuff where it would be hard to mow.
Where at around Claremore?
If you can, do your cleanup now through spring (you'll have less foliage and obstacles to contend with).
I'd sure like to get the cleanup done now, but still got some remodeling to do. I think I'll get some cleanup and some mowing done before this spring, then finish next winter.
Pretty much between Pryor and Claremore. I checked google, and it's the same distance to the Walmart in either town. Since that's a common measure.