Decathlon has nice/budget option helmets. But Idon't think they have anything that gets into hi-tech stuff.
Prowell had good helmets, which I would say were a good option for regular riders, who were budget conscious. Used to be under rs2K, but has gone to rs2.5K, i think. I suppose they continue to make the quality helmets, which I last used ~3yrs back.
Beyond the rs3K price would be the start of the hi-tech range, IMO. I have been using Giro MPS, for past ~2-3yrs. Priced at rs6K+. You will need to look into tbe specs of each of the hi-tech helmrts, to understand what features they have. If you check various cycle shops in BLR, am guessing you'll find helmets upto rs15K-20K.
-{db}.