http://www.giro.com/us_en/ionos.html

Buy one on E-Bay though, sometimes you can get a really good deal. I paid $170 for mine with free shipping, so it wasn't the best deal out there, but better than the $230 MSRP.

If you are concerned about having a unique helmet though, the Ionos is/was the flagship Giro helmet, so it is pretty common.