RuneList ad banners are monthly auto-recurring, so this means it must be cancelled by the renter or 'bought-out' in order for it to be available again. If an ad banner is not available, then you have the opportunity to buyout the spot by offering more than the listed price ($25+ increments). The current renter of the ad banner has the opportunity to make a counteroffer of $25 or more than the 'buyout offer.' If the current owner does not wish to counteroffer the buyout, then the buyout offer is accepted. In this case, RuneList will cancel the current renter's auto-recurring ad subscription and the new buyer will pay the 'buyout' price offered.