I personally really like www.hotelscombined.com.au
While you cant book directly through this website - you can put in the area (eg jimbaran) and the dates you want to stay (anywhere in the world not just Bali)
It searches hundreds of different booking sites (including the big ones like expedia)
It shows you in a detailed list of only websites that still have availability at any particular hotel
It also gives you a list of different room categories (Eg standard room or deluxe room etc) and next to it, is the cost total (including taxes or fees) for each particular room via the different sites.
For example:
I was all set to book Ayana Resort for 3 nights at the price total of $1412 (Standard price i thought)
Luckily enough i came accross this website just before i booked as not only did it show the website i was about to book through (and its price $1412), but picked up a special through expedia and i ended up only paying $1049 for the same room category and same dates.
I hope this helps!