Yes, this is known as a PTA-ticket. Not all agencies will be able to do this for you, but it shouldn't be too complicated. The cost is typically somewhat higher than buying a similar ticket in the Philippines directly, and considerably higher than a ticket from a Western country to the Philippines. Note that this is easiest with e-ticketing, as then no tickets have to be send (by express mail, or using a travel agent in the Philippines). In such cases a simple fax or email with details will suffice. Make sure you have the correct passport details, such as the spelling of the name, and that visa and exit requirements are met.--Jeroen.

Thank you. I have no experience with booking groups, as I've booked at most five people at once. Probably you should be with ten or more to be able to get something of the price. Since nowadays most agents ask booking fees, you already safe on that, but I admit that is not much.--Jeroen.