Sterling Vacation Homes has a 7 bedroom, 5 bath home for $2450 for a week. That's their Formosa Garden estate, which we stayed at this past March. It's an absolutely BEAUTIFUL house with tons of room. They also have a 5 bedroom, 4 bath home for $1,120 (Dolphin Springs) that we stayed at in September 2004. Also a great home, but not as big as Formosa Gardens. You can check out their website at sterlingvacationhomes.com.
And no, I don't work for them or anything, I just had two really great experiences with Roberta (owner) and her homes.
They are all renting direct sites, but usually they are some of the best deals around. I've used them multiple times (vrbo for Orlando and other places).