How to market house on line while the house still has a sell by owner Ad @ different price?

[Gamal Darwish]

I contacted Sell by owner on craiglist via email and sent to him a link to my website. he filled a seller form , we talked on the phone and we meet to sign option agreement for 130 k for 45 days.

His sale by owner ad - is all over on line for 135.9 K .

HOW COULD I ADVERTISE ON LINE WHILE HIS AD STILL THERE?

Any thoughts - how to overide his ad from all major marketing websites? thank you