I'm surprised but the prices you quote are not out of line for the US either at least for new boards list prices. (There is probably some discounting, but I don't know how much. 10% seems possible, 20% seems too high.) The closeout type boards can have a pretty wide price range due more to local supply/demand but even there your numbers are plausible. Suprising given the weakness of the dollar and the strength of the euro. Perhaps its not the euro/dollar ratio that controls, but dollar to the Thai currency?
How about sails. In the US a new sail is usually in the $500-$700 ranges.