As there's nothing on the official website, thanks guys, it took a call to the office and they gave me the prices given below.
Ticket Prices (we hope their right!)
Adults - £18, Senior Citizens - £10, Under-16's - £6, Under 12's - £5.
No word on Students, check when there, or give one of the numbers a call below.
Rotherham Ticket Office: 0844 414737.
Blues Box Office: 08444 77 00 77.
Good luck and enjoy the game.