you all make good points.I am a seller and buyer.I ALWAYS look at postage if I am a buyer,and ask if its not mentioned before I bid....but I have just had an interesting experience.I listed for sale for the first time, two items on ebay USA,with postage..from Oz to USA...but my bidder was from Italy!He didnt ask me what the cost would be,and yes it was a little more.So in good faith I posted it. Not sure if I have done the right thing,but I have posted it,not told him,and asked for the extra few dollars.I feel he should have asked first before bidding....I dont know..It will be interesting to see if he pays me the few extra dollars.Shouldnt he have asked me before bidding?

You have been very generous by posting it but you won't make money if you have to take it out of your own pocket. If the buyer sends you the balance it's a win for you but I can't see this if you didn't tell the buyer.

I have on my listings that any international bidders MUST email me first as postage is different to some parts of the world. If they don't email me and win a buy it now item I email them with the cost of postage.I then ask them to immediately pay with PayPal or reply if they don't want to go ahead with the transaction I then open a dispute to cancel the transaction. I also state in my listings if you have a zero feedback the buyer is to contact me before bidding then I can cancell their bid if I am not convinced they are genuine.

eBay will give you the persons details and with this I phone them to see if they are the real deal. It is hard to know what's right but I find this works for me. I did this as I had 9 unpaid bidders all with zero feedback in 13 days and 2 international buyers as well.
Hope this helps a bit but please don't send anything until it is fully paid for and also if you are not sure how much to charge for international put in your description the buyer must email you first.

There are a few very dedicated people on the forums who will have better advise than me so hopefully they will see this and help you. But as I said this works for me until I learn allot more. Regards