$9-$12, for 1/2" 4x8 sheets, depending on your location.
at $10 a sheet, you're looking at about $.50 a sq. ft. including compound, screws and tape.
Your room requires 1,124 square feet of drywall.
Total cost: $562.00
If you were to pay someone, they would charge around $.70 a square foot to hang dw plus materials, per sq. foot(that is the cost in this area, but again, it depends on the location), which means you would save around $785.00.
To find out what you're looking at cost wise, find out the price for a sheet of drywall and visit this page
. Plug in your numbers and you'll get an idea of what you're looking at price-wise for the drywall only
. You'll still need to purchase the ancillaries, which explains my higher cost.