didnt beerman search for the same thing a while back? you can try stockton or john351c on the POR board. he may be able to make you some. if you want cheap, this is a fairly new rim size & you will have better luck with 16.5s for cheap steel. i know from your other post you need bigger sizes.
IIRC, I think Beerman actualy said he could get the rock crawlers from 4WPW, but I may be wrong...it's been awhile back...I helped him search but he found what he was looking for so know I don't remember...:shrug