Mandarin
I think Mandarin and Intercon in Makati City gives discounts.
Mandarin +63 (2) 750 8888 , +63 (2) 819 9683
Intercon +(632) 910-4203 up to 05 , Call from the USA: 1-866-467-2753
Call from UK: (44) 800-804-8311
You can try Calling them , no harm in asking.
Just like club2jets is saying , just make sure you bring your ID's
Godspeed