It is possible to go on a North Sikkim tour now, but it's important to check the current travel restrictions and guidelines before making any plans. The COVID-19 situation is constantly evolving, so it's important to stay up-to-date with the latest information from the government and health authorities. As for the cost of a North Sikkim tour package, it can vary depending on the duration of the tour, the number of people in your group, the type of accommodation you choose, and the activities you want to do. On average, a 5-day North Sikkim tour package can cost anywhere from INR 10,000 to INR 25,000 per person, depending on the above factors. It's recommended to do some research and compare different tour packages from reputable tour operators before making a booking. Make sure to read reviews from previous customers to ensure you're getting a good deal and a quality tour experience.