Covishield will be sold at ₹ 400 a shot to states and ₹ 600 to private hospitals, the Serum Institute of India (SII) said today, days ahead of a new round of vaccinations from May 1 that will include all above 18. The centre will continue to receive Covishield doses at ₹ 150 each, which means it will be cheapest to get a Covid shot from central government hospitals or establishments.