call all the resale companies and
DVC get on their list and they will call you when a new one comes in. Lots of the time they never get posted because there are so many people that want BCV with so little contracts available.
The resale companies will tell you what they think will pass but it is a guess and you still have to decide if you want to pay more to make sure you will pass.
I did not and Disney bought back the one I was trying to buy.