Hotel prices can go up during peak season but a wide range of affordable accommodations can be found. To find the best deals, book well in advance. Mid-range hotels can be booked for about PHP 2500 a night, with many options above and below that price range.
The Department of Tourism campaign page offers options to find accommodations. They also have a homestay program which allows you to experience the Filipino way of life while getting to know the people up close. You can inquire by sending an email to dotsdd@yahoo.com.
Guest houses or pension houses can offer a low cost option during vacation time (summer or Christmas). Though not hotel standard, they usually have excellent value with good locations.