Many of the ticket brokers have other tickets available that they do not list on their web sites. Sometimes they are prohibited by Disney from advertising them. Sometimes they are running low on a particular ticket that was sold to them as a limited sales window ticket.
Either way, your best bet is to call or email the broker to see what is currently available and the price. Web sites for brokers are a guide, not a listing of everything they sell. You should be able to find 3 day PHP's fairly easily right now.