There is no one that can “guarantee” a foreclosure sale to be stopped, however by having and showing a signed and executed /accepted Purchase & Sales Agreement with a ready willing and able Buyer (us for example) that can help cancel the pending sale to work towards a closing.  Reason being a foreclosure means the lender/debtor will potentially get the property back after a costly foreclosure process and have to sell it later.      If there is a pending sale now and they can get paid what they owe, they would often try to work with this transaction.