I LOVE THE WOOL BATTS!!!
they are wonderful to work with, DO NOT SHRINK, are machine washable and dryable; needle beautifully; have a wonderful loft, lightweight, but warm...and being inside a quilt there is no itch factor to worry about.
around here a queen wool batt runs $30-$40 depending on the shop. I have not seen any at joannes. i would read the packaging well and see what it says about laundering and about how close you have to quilt it, i'm sure not all are created equal. i have only used Dream Wool, and Hobbs heirloom wool. both were absolutely fabulous! if i could afford it i wouldn't use any thing else.:)