You can book your Samsung Galaxy S4 from the official samsung store, which will costs 41500 INR and first 400 successful orders will get an accessory bundle for free.
The product will start shipping from 27th April 2013.
Specs
Processor 1.6GHz Quad + 1.2GHz Quad
Full HD Super AMOLED 920 x 1080,441 ppi Display
Android 4.2.2 (Jelly Bean)
13 MP Camera
16 GB
2,600 mAh Battery
Read more and get it 