Purchase Contract with Title Co--Seller Gets Cold Feet

[Austin Hughes]

I have a purchase contract for a property Subject-To existing financing. The contract states that this is how the property will be purchased. 

Now, the seller doesn't want to do that. They backed out, and said I can only buy it with cash. I told them the only reason I agreed to this price was because I was taking over payments. 

It would still make a decent wholesale deal, but I'd much prefer sub-to. However, I can't really wholesale it since they've put up this front. I can't get pictures or access to the property, and who knows if they'd actually sell it after they did this to me.

My contract lasts until the end of November. Any ideas?