Is it possible to put the doll(s) in a plastic bag-similar to a space bag-and sucking the air out? You might be able to ship more than one in the box, and they should fluff up nicely when opened. Definitely shop around for shipping fees, and remember, the first pound is ALWAYS the most expensive. You may be able to squish two or three in the same box and save yourself quite a bit. I'm assuming of course, that the dolls are fabric and squishing won't be harmful to them. I certainly wouldn't want your hard work damaged!