Depends where you are , but usually about 20% more than regular drywall.
$6.00 per sheet
$4.44 for a sheet of 4x8 1/2 in drywall at menards in Morris Illinois
The cost of repairing drywall damage would depend on how much damage is done. If you were to buy the drywall it ranges from $10 to $30 a sheet. Plus if you hired someone then it would cost more for labor then it would if you did it yourself.
If you want to do a really good, lasting job, use concrete/fibre board (Green board) instead of drywall. It comes in 30x60 sheets, about the same cost as drywall, easy to work with , totally water resistant and excellent for tiling. About 4-5 kinds available, Rona and HD each have 2-3 types.
About 50% more than the 1/2 inch ,because it's unusual and not in much demand .Generally 18-20 per sheet.
It costs around $30 to $45 / sheet and $1.50 for /foot
On Average the cost to install drywall in most major cities is roughly 3.00 per sqft. Of course this depends on the size of job. A simple way to cost out the price of a drywall job is to basically figure out how many sheets is required and base it per sheet complete at a cost of 100. that includes taping and finishing.
About 38 cents per square foot at current board costs.
$40 per board (including materials) in my area: North Carolina
It will cost about $1.40 per square foot to texture drywall. The total will generally depend on the amount of texture you're looking to get done on your drywall.
There is no effective way to do this without destroying the surface of the drywall. It is more cost-effective to simply replace the drywall.
Mildew proof drywall is best out of drywall choices, -but much better still is concrete/fibre board. These are now plentiful and low cost, totally impervious to water and great for tile. Last time I was in Home Depot they had 3 kinds. I always these around bathtubs or shower areas.