I bought a Bern Brentwood, in size XXXL, through Erik's bike shop in MN. They had the lowest price ($72), free shipping, but most importantly - they carried the triple-extra large size. REI only goes up to XL.
http://www.eriksbikeshop.com/2012-Brentwood-Helmet/PR3C6170/ProductI got the gloss white model, and now I look like a bicycle policeman when I'm riding. It will be fun to decorate with some hi-viz retroreflective tape.
- Andrew, Berkeley