Supercat has an on-going promo dubbed as "Tipid Trips Promo".
Promo started last November 7, 2007 and will last until December 14, 2007. There will be a flat rate of Php180 pesos for all types of passengers (regular, students, senior citizens, minors, and disabled) for the first 30 passengers or within one hour after the previous trip has departed, whichever comes first. The promo is for selected trips only, on first-come, first-served basis and there is no advanced issuance of tickets.
For the non-Tagalog speaking readers: Tipid means "thrift", so it may go like Thrift Trip Promo. :-)