Cotton Babies sells stay dry socks. I think they are about $2.99 each. They are that same suedecloth cut into a sock. It has one open end that folds over to close it after you stuff it. I have a ton of them here & they are great to make everything stay dry.
I also really like the Motherease stay dry absorbent liners. They are an athletic type stay dry material that is my favorite stay dry material. Sew Crafty Baby sells those & has the best prices I've found on them.
Mom to my girls ('94), ('99) & ('02)
And my little guy (12/09)