Please note that only flat paper, card and kit items are sent by letter post. Everything else is sent in plastic boxes, tubes or similar-no matter how small the item is to avoid crushing in the post. The current postage cost of a uk packet is £1.28 and a large letter is 61p. The  International rate varies but a small packet airmail starts at £1.68. Almost everything is sent in bubble envelopes and often individually wrapped in tissue as well. I have to take into account packing time and travel costs so if you think that you are going to have a problem with the cost of postage then please don't bid then query it later!