Southeast of Marathon is Black Gap WMA.
http://www.tpwd.state.tx.us/huntwild/hunt/wma/find_a_wma/list/?id=2Try this link and call them.
More than likely you will have to pay to hunt on private land in Texas and it is usually not cheap. Hunting in south or west Texas has changed in the past 10 years. Property taxes have increased, cattle aint worth much, oil prices dropped, insurance and so on. These things have put pressure on the landowners and the price of a hunting lease goes up. Of course lazy hunters that dont shut gates or trash a place does not help.
I live in south Texas and know the prices of a decent lease are out of reach for the common working man. A decent lease to me is one with a yearly water supply, brush and 100 or so acres for one hunter. A lease such as this in Mcmullen county will run 2500-4500 dollars a year. That kind of money can buy a cow and have it butchered.
A young fella told me the other day that his hunting lease is 7500.00 per year and he got a loan from the bank to pay it this year. Most of the high dollar leases are for corporate clients or big money men.
Things have changed down here.