i purchased it from DM lubricants aka mobil 1 shop at the exit of defence, main boulevard, they are now legit distributors of Repsol products as well. its not available in 3 litre packing but i think 1ltr packing was available but not sure. and many different viscosities are available, the one i chose is their top of the line,they have 10W-40, older api grade 5W-40 and more viscosities as well in repsol. price is not very expensive either.
5W-40 elite competition API SN if i remember correctly was around the 4200rs mark for 4 litres but could have been cheaper as i purchased more stuff with it and dont remember exact amount.