First of all, all shipping originate from Shenzhen, China, so all shipping will be considered as international shipping.
Second of all, rewards with water drop photography contains heavy items, such as 24V 3A power supply, solenoid valve, heavy duty plastic bottle, brass nozzles, etc. These items weigh a lot. Having shipped hundreds of water drop kit since Nov. 2013, shipping cost is well known for us.
Thirdly, DHL and EMS charge by increments of 0.5kg (1.1 lbs), if weight exceeds an increment, even just by a few grams (for example all paperwork that must be shipped with package), they will charge at next increment level.