Hi

Firstly, whatever you pay in these Special and Spot Rounds, you will not get the money back. There is option to refund the fees. 

CSAB fees for an SC Candidate is Rs. Rs.16,500.

You can always check the same about CSAB Special round for NITs, IIITs and GFTIS 2019 in a greater detail through this link: https://engineering.careers360.com/articles/csab-special-round-for-nits-iiits-and-gftis.

Best of Luck.

Hope this helps.

Cheers!