For the availability, we would suggest you walk into the nearest dealership as they will be the better people to assist you because it depends on their stock book. You can click on the following link to see the details of the nearest dealership and selecting your city accordingly - Car Showrooms.
Both cars are good enough. Choosing one will totally depend on your requirements. If you are looking for a feature-loaded car with better off-road abilities, you may go for Land Rover Range Rover Velar. On the other hand, BMW X5 offers a more spacious and comfortable cabin and it delivers way better power performance too. You may comopare both the cars accordingly. Do take a test drive in order to get better clarity. Check out authorised dealership details.