We were a group of 5 people travelling from Dhanbad, Jharkhand. We took train upto Siliguri and took bus from Siliguri to Jaigaon. Jaigaon is the Indian side of the Indo-Bhutan border. We booked our travel package from Jaigaon with All ways tours and travels. They charged us 39,000/- for 5 people. They covered the travelling, petrol and lodging charges. Food in Bhutan is slightly expensive than India, so food was upon us.
Bhutan accepts both passport and voter id card for Indian permit. Monday is usually rush at the permit office. So it's advisable to go to the permit office as early as possible. For bikers, vehicle permit and traveler permit are required.
Some points to remember while entering Bhutan:
1. Water in Bhutan costs more than India. So buy water bottles from Jaigaon.
2. Road from Jaigaon to Thimphu is steep with lot of curves which will cause vomiting and breathing problems. So buy medicines from India.
3. Take proper winter clothes as temperature in Bhutan is between 1-5 degree centigrade.
4. Exchange Indian rupee to Bhutanese Ngultrum and carry enough Ngultrum as Bhutanese banks charge heavy fine for ATM withdrawals.