Chad,
Check out Regional Price Parities (RPP) for the original source, www.bea.gov. (Sign up for email notification too). The 2014 number is actually a bit lower than 2012,2013, which showed a 17 percent price differential. They also break it down. So goods in Hawaii are 103, housing/rents 149, local services are 102. And that is really where the problem comes in with the Tax Foundation. It is not that they are "conservative" but that they are proponents of supply side ideology. Who would like to pretend that all prices are high in areas and those are caused by by supply side problem, like pesky regulations, Jone's act,  or excessive labor costs.