i've got a 32" yakima wind fairing for sale. i decided to do hitch mount bike rack instead of roof mount, so i didn't do the roof fairing.
i payed $50 plus shipping, but i'll let it go for $40 shipped. you would still need to purchase mounts for the fairing. others have used horizontal 'mighty mounts' made by yakima for this application.
let me know if you're interested.
-james
LJamesDickinson@yahoo.com