Granite slab prices vary on two things: Size and Quality.
Granite comes in 3 sizes:
1) Cutter Size: 4 to 12 Feet in Length and 1.5 to 3 Feet in Height
2) Mini Gangsaw: 7 Feet up in Length and 4 Feet up in Height
3) Gangsaw: 7 Feet up in Length and 6 Feet up in Height
Generally, depending on the granite,
For cutter size (4 to 12 Feet in Length and 1.5 to 3 Feet in Height):
Commercial Quality ranges from Rs. 45 to Rs. Rs. 85,
Medium Quality costs from Rs. 75 to Rs. 300
First Quality costs from Rs.80 to Rs. 500
For Mini Gansaw Sizes: (7 Feet up in Length and 4 Feet up in Height)
Commercial Quality ranges from Rs. 85 to Rs. Rs. 150,
Medium Quality costs from Rs. 100 to Rs. 500
First Quality costs from Rs.110 to Rs. 800
Gangsaw sizes (7 Feet up in Length and 6 Feet up in Height):
Generally gangsaw sizes are available for Rs. 120 to Rs. 1500 and more..
Prices are in Rupees per Square Feet for Granite slabs only.
There is a loading charge of Rs. 1 per Square Feet
Taxes are 14.5% (Rs. 7-15 per square Feet)
Transportation cost to bring it to your place and unloading,(In Bangalore Rs. 1.5 to 5 per Square Feet)
Have fun hunting!