What Tipstr and xaueious are accurate. The question I would ask in return is what brand is it and how much did you pay for it.
The labor for someone in Baltimore to replace the screen would be about ~$75-100, if you find someone willing. The screens are what Tipstr provided. So if you bought the unit for 150,you may be just as well to buy another replacement.
The profit per unit is very small on the low-moderate tablets. I had a year old Archos which retailed for $400 and to replace the 40Gb drive would cost $300. I found a used one with a 160Gb drive for $150. I took the risk and was happier. I would suggest, buying a replacement.