Mousie, I understand the "postage cost" situation. I do Quilts of Valor and long-armed it. I was assigned to send it to someone in Germany! Boy, never again! I now work with a local chapter that donates to the local recipients...so no more mailing!
I wanted to suggest for the child-type fabric......check on the Project Linus web-site to see if there is a local contact. When I go to the Project Linus luncheons in our town, they always have a room full of donated yarn and another room full of donated fabric. Perhaps there is someone near you who can come pick up the fabric.
Good luck and hope you are still able to enjoy quilting. We do what we can at the pace we enjoy.