Beautiful dolls.
Have you tried ordering on usps.com the large game flat rate priority boxes? They are free and you can fit up to 70 lbs in it and it's 15.70...I think. I mail fabrics in mine but have mailed dolls I make as well, just a little squeeze and in they go. SOmething to think about.
You are gifted and thank you for all you do.
If you will Pm me your address, I can send out a package of threads and jewlery, etc for dolls, even cute wigs and misc doll items. I also have plenty of doll fabric for bodies. Beiges mostly.