I stayed in two vacation homes for less than $600 for the week.
I also stayed at the Westgate Lakes for $35 a night the end of the year.
I checked the following deal for a friend of mine on a budget:
Suburban Lodge Universal -- $249 for an entire week.
I stayed there when it first opened in 1999 and it is a very nice property. Across the street is Extended Stay which usually matches SL's rate.
I do understand the non commitment to Priceline, it is the best deal usually but it's not very flexible.