Wow thats cheap, better bid quick! "STOP" and look at the postage. It may be more than unreasonable. Many of the commonly used postal services have a website where you can calculate the postage, you will then know what is reasonable.
Australia Post, the US Postal Service (UPS), Royal Mail (UK) all have international shipping rates listed on their website.
One point to remember is that these services do not generally ship larger items, hence the seller may use a specialist courier. Specialist couriers will tend to be more expensive than a standard postal service. Specialist couriers will also list their shipping rates on their websites as well.
Handling is the extra charge the seller may add to the postage for packaging and handling, this is where some unscrupulous sellers make their money. Do the math and make sure you dont get caught whith over exorbitanat handling charges.
You will then get that bargin you've been looking for.