The most obvious thing for me was cigarettes. Bought 200 Marlboro Lights for 350 peso's which I think is equivalent to a packet of 20 major brand cigs in the UK.
At some places managed to buy a sandwich for about 20 pence and a bottle of coke for the same.
I went on a Jeepney ride for a couple of miles for about 10 pence.
Managed to get a really filling meal out of Chow King for about a £1 with a drink thrown in.
Can only recall buying stuff that was overpriced twice. Asked for a bottle of coke on Magalawa Island, they came back with a big bottle and four of these biscuits which were like crackers with a lemon filling. Didn't ask for the biscuits. Thought they were being hospitable. Charged us 300 peso's
Got a can of coke at N.A.I.A. Cost 93 peso's.
Was quoted 6,000 peso's for a return boat trip to Magahawa Island from our resort. Thought it was really steep. Instead we got the Victory Liner to Masinloc for about a £1 each which took about 30-40 minutes, then got a boatman to take us to the island for 2,000 peso's return.