Imperial at Midlink Plaza (same building and just beside Stanley Colour) has good prices for certain flights as well.
Just call them up one by one from the classified ads and get all the details before going down to the one with the best price.
Who has used priceline before? Does it really give good prices? You have to bid for a price, and that involves some time delay right? Could someone describe how much time delay and cost savings is involved in priceline purchases?