At Gales Point, hostels are not so numerous. However you can still find places to stay for a moderate price. For instance, Ionie's B&B is one of the best places to stay in Gales Point, Belize: it offers double rooms for less than $30 and the place is very clean.
Gentles is a small hotel but clean and perfect for a family: the owner organizes a lot of activities and trips.
For campers, the Metho's Campground is cheap and has an ideal location near the lake, with a beautilful view at sunset.