Room rent at Ooty depends big time on the season. For most part of the year, just land there without any booking. Look around and book a room after a fair amount of negotiation. For instance, a good hotel on lake road in off season will be Rs.800 per night or even lesser. You need advance reservation only if you are travelling during Christmas weekend or between April and mid June.
In off season hotels are empty, room rent will be a third of what is published on their website. For instance, today (7th February), I checked rent of Deluxe Suite in Elk Hill - A Sterling Holidays Resort. Makemytrip quotes approximately 45% of that quoted by the resort.
If you are lucky to be there on a weekday in an off-season, you could be the only guests of a star resort. Be prepared to be pampered though you have paid less than what a budget resort would have costed. Check some online booking sites for indicative tariff and then contact the resort.