Hey Akash, As you will reach Manali bus stand there will be number of persons who will ask you for the hotels. They will show you no of hotels ranging from Rs300-1000 near Mall road (main area of Manali). Or you can prebook with MMT or OYO.
There are alots of budget hotels at mall road Manali which you will have to negotiate.
just reach at mall road.
visit the hotels nearby check the rooms and if you like the room negotiate the rates usually a budget hotel room will cost 500-1500/- INR.
You can try hostels over hotels for all the known reasons.
https://www.hostelworld.com
Check this website for all budget hostels in Manali.If you haven't stayed in a hostel before,you are missing a big thing dude! Try it out :)
Backpacker's Panda will be a good option because they have 350 Rs per bed and with amazing view , wifi and awesome travellers around you will be a good experience overall
As per experience, Royal INN Manali is the budget hotel to stay with your friends and family. You can also book budget hotels via bookings. com, MakeMyTrip and other traveling portals. They have all types of hotels from mid-range to high. Budget friendly room will cost 1000-1500/- Rs. only in off season.