That truly depends how you want to explore this beautiful but vast place, i.e on a bike, or SUV, or by local buses. Cheapest way is by bus, but they dont take you to all the places. If you are confident and experienced enough, try to explore on bike, its the best way. Join any such groups, which organised such tours and provide you almost everything from bike to gear to fuel to backup truck and cost around 20-35k. The last way is to hire a cab with a local driver who will also be your guide there. Its the most easiest, comfortable however boring way to explore the place. I said boring because, for some, at some point of just sitting in a car for long hours. Go through this website vargiskhan.com you will get all detailed info about ladhak here.