If you are willing to stay offsite, you should definitely check out Skyauction.com and look at their ReadySetGo auctions. They sell tons of timeshare weeks in Orlando for dirt cheap if you pay attention.
We are going in early September and staying in a 2 bedroom condo at Orange Lake Country Club for $265 total. (The minimum is $196 because they add $195 even if you win an auction for $1.) That works out to $38 per night (including all taxes) and we get a full kitchen and full-sized washer and dryer.
They run several auctions, so if you watch you can get them in the $250 range. Just check availability at Orlando resorts, reserve the week you want and bid away.
IMHO this is the best offsite deal going for the offseason, because you can easily make breakfast and dinner in the full kitchen and save money on food, and you get to stay in a large apartment rather than a ratty hotel room. Give it a try!