Where can I buy a cancelled wedding contract/venue?

I think you might want to call the venues you like and ask them if they have any cancellation. Give them your info and your target dates, and see if they are willing to work with you.

That was my guess...

You can actually look here on wedding wire. They have a section I believe its called deals. Click on your local area and you might be able to find it. I know I saw a hotel in Philly giving a huge discount on a wedding. Granted, this may make planning time a lot shorter than expected!

Oh one more thing check under venues in your areas and most of them will have a "deals" section too, if that helps!