If I may chip in from a UK vendors perspective just to clarify a few of the points raised in the thread?
We are only a small independent family company, and appreciate shipping costs are important to you, which is why we try and remain as competitive as we can and offer free UK shipping over £15. The price we charge for orders under £15 pretty much wipes our nose on shipping costs, plus box, packing materials and transport to the PO each day. We'd love to be able to offer free shipping on everything but for a company our size it simply isn't viable.
There are different levels of service available, obviously, and each retailer/vendor/artisan will choose the service they deem best for them and their business. However, as somebody has alluded to in a post above already, there are some unscrupulous people out there (sadly, and mostly residing on eBay) who will say an item has not arrived simply because it isn't signed for which forces companies to charge more to get that all important signature, it's a vicious circle. Fortunately for us, we use an RM business service which is barcoded and scanned on delivery, so we do get that proof of delivery.
International shipping is a difficult one, so we offer two options for either tracked or untracked service based on the customers choice. This is weight based on a table provided by the PO, and upgrading to tracked service at our cost is at our discretion if the parcel is over a certain amount and we require that peace of mind. There are some international sellers who are more than happy to fudge the figures on customs documents in an effort to avoid import taxes and thus make their goods appear cheaper and more appealing to foreign markets. This, in our honest opinion, gives them a massively unfair advantage for their willingness to lie and bend the rules, but what many people do not perhaps realise is that all the risk lies with you, the buyer! If customs do smell a rat and check and confiscate you parcel, you the purchaser stand that cost and your vendor gets away scot free. So are they REALLY doing you a favour?
Hope all those ramblings help!!