The Grand i10 petrol is available with 1 week's waiting period while the diesel having a waiting period of around 2-3 weeks. There is a lot of demand in festive season therefore no car is available with on spot cash payment.
However, check the availability at your nearest Hyundai dealership.
Refer this link to find nearest dealership in your city- http://www.cardekho.com/Hyundai/cardealers
That's great if you are planning for a new car. It might interest you to know that Hyundai is planning to launch the facelift version of the Grand i10 sometime this year around August/September. The Grand i10 facelift is also likely to get AMT (Automated Manual Transmission). So if you are planning in 1-2 months, we suggest you to wait for its new facelift version and other new upcoming cars.