A good place to start is to reach out to Rachel Durbin at Kerzner (O&O's Parent Company). She will help to pull together available dates and group rates for you and then assign you to a wedding planner at O&O. We worked with Avani as a wedding planner and she was awesome! Her email is Rachel.Durbin@kerzner.com.
While I wouldn't call O&O affordable, we did save some money by hosting our wedding in the low season during October. Our guests received really great group rates as well. The weather was gorgeous the entire week. It got a little windy at times, but it didn't interfere with anything.
One thing I will tell you about O&O is that you will feel like a celebrity bride. They have outstanding customer service and go out of their way to accommodate the bride and groom. It was amazing! Truly worth the expense.