Mary - You may want to try one of SkyAuction's "READY SET GO" auctions. When you go on their site just do a search for key word "ready". They have one or two of these auctions closing each day.
You then choose Orlando, the dates you want and the size villa you want. It will then search for available resorts for that time frame.
The nice thing about this is that you can actually reserve the specific resort you want before you win the auction. That way you are guaranteed to stay where you want and you won't find out that there isn't availability after you already won.
The auctions have been running it seems anywhere between $45-$70 a week. Then there will be an additional tax and service charge of $195 per villa for the week. So you can win a weeks stay for around $250 - $300.
If you win, you have to pay right away and then they will email you a "guest certificate" which you just hand to the resort at check in.
We used them for this in November and won Orange Lake (which was awesome). This May we are staying at Silver Lake which we also won at Sky Auction.
What I do is when I see what resorts are available, I check out TripAdvisor.com to see if there are any reviews about it.
Hope this helps you.
Heather
P.S. The one thing I find is that if you win over the weekend, their office is closed so you have to wait until Monday to call them with any questions. Can be frustrating if you win on Friday night and then have to wait all weekend to get a question answered.