Hi Geetanjali, May-June is tourist season in Manali so prices are going to be higher. You can stay in Zostel, old Manali or you can find cheaper homestay in Vashisth near the temple area. You can also check out Babushka stay in Vashisth. You can check out airbnbs in Manali, some of them offers discount on a month stay. Check here: https://goo.gl/GoEoPp Keep exploring!