Definitely overpriced.
Food, accommodations and logistics are quite cheap.
Birding in Palawan is not so complicated. Most birds you can find is near the trail of the subterran river at Sabah (may be wrong spelling). In 2006 and 2007, there was a tame male there (but I missed it at that time).
If just two days and you alone, it is suggested that you do a little bit of homework by studying birding reports.
People in rural areas are friendly and always offer help.
Good luck
Captain