EliteFTS has them for the most $$, close to $480 shipped.
This site, totalstrengthandspeed.com/, has them for about $80 cheaper. It looks to be the same barbell manufactured by Williams Strength I think without the middleman fee from elite.
Westside is selling them on there site for $400 shipped, which seems like the best deal.
I tried Texas Strength Systems, and they had a cheap one, but I emailed them and they said they didn't start manufacturing them yet.
Does anybody know of any other manufacturers or can provide a review of any of these bars?